diff --git a/gen/com/ibm/Dump/Create/meson.build b/gen/com/ibm/Dump/Create/meson.build
index 94158ae..f36c5e8 100644
--- a/gen/com/ibm/Dump/Create/meson.build
+++ b/gen/com/ibm/Dump/Create/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/Dump/Create__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Dump/Create.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Dump/Create.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Dump/Create',
     ],
 )
diff --git a/gen/com/ibm/Dump/Entry/Hostboot/meson.build b/gen/com/ibm/Dump/Entry/Hostboot/meson.build
index 8d10a84..1955bd6 100644
--- a/gen/com/ibm/Dump/Entry/Hostboot/meson.build
+++ b/gen/com/ibm/Dump/Entry/Hostboot/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/Dump/Entry/Hostboot__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Dump/Entry/Hostboot.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Dump/Entry/Hostboot.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Dump/Entry/Hostboot',
     ],
 )
diff --git a/gen/com/ibm/Dump/Entry/Resource/meson.build b/gen/com/ibm/Dump/Entry/Resource/meson.build
index f815342..be32606 100644
--- a/gen/com/ibm/Dump/Entry/Resource/meson.build
+++ b/gen/com/ibm/Dump/Entry/Resource/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/Dump/Entry/Resource__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Dump/Entry/Resource.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Dump/Entry/Resource.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Dump/Entry/Resource',
     ],
 )
diff --git a/gen/com/ibm/Dump/Entry/meson.build b/gen/com/ibm/Dump/Entry/meson.build
index 0b7b658..2703737 100644
--- a/gen/com/ibm/Dump/Entry/meson.build
+++ b/gen/com/ibm/Dump/Entry/meson.build
@@ -2,13 +2,13 @@
 subdir('Hostboot')
 generated_others += custom_target(
     'com/ibm/Dump/Entry/Hostboot__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Dump/Entry/Hostboot.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Dump/Entry/Hostboot.interface.yaml',  ],
     output: [ 'Hostboot.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Dump/Entry/Hostboot',
     ],
     build_by_default: true,
@@ -17,13 +17,13 @@
 subdir('Resource')
 generated_others += custom_target(
     'com/ibm/Dump/Entry/Resource__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Dump/Entry/Resource.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Dump/Entry/Resource.interface.yaml',  ],
     output: [ 'Resource.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Dump/Entry/Resource',
     ],
     build_by_default: true,
diff --git a/gen/com/ibm/Dump/meson.build b/gen/com/ibm/Dump/meson.build
index 685355e..8616d97 100644
--- a/gen/com/ibm/Dump/meson.build
+++ b/gen/com/ibm/Dump/meson.build
@@ -2,13 +2,13 @@
 subdir('Create')
 generated_others += custom_target(
     'com/ibm/Dump/Create__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Dump/Create.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Dump/Create.interface.yaml',  ],
     output: [ 'Create.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Dump/Create',
     ],
     build_by_default: true,
diff --git a/gen/com/ibm/Logging/Policy/meson.build b/gen/com/ibm/Logging/Policy/meson.build
index 83e092d..61b69b3 100644
--- a/gen/com/ibm/Logging/Policy/meson.build
+++ b/gen/com/ibm/Logging/Policy/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/Logging/Policy__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Logging/Policy.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Logging/Policy.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Logging/Policy',
     ],
 )
diff --git a/gen/com/ibm/Logging/meson.build b/gen/com/ibm/Logging/meson.build
index d03b2a8..aa6205b 100644
--- a/gen/com/ibm/Logging/meson.build
+++ b/gen/com/ibm/Logging/meson.build
@@ -2,13 +2,13 @@
 subdir('Policy')
 generated_others += custom_target(
     'com/ibm/Logging/Policy__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/Logging/Policy.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/Logging/Policy.interface.yaml',  ],
     output: [ 'Policy.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/Logging/Policy',
     ],
     build_by_default: true,
diff --git a/gen/com/ibm/VPD/Manager/meson.build b/gen/com/ibm/VPD/Manager/meson.build
index 76994fc..b733478 100644
--- a/gen/com/ibm/VPD/Manager/meson.build
+++ b/gen/com/ibm/VPD/Manager/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/VPD/Manager__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/VPD/Manager.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/VPD/Manager.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/VPD/Manager',
     ],
 )
diff --git a/gen/com/ibm/VPD/meson.build b/gen/com/ibm/VPD/meson.build
index 3d297e2..008ea5e 100644
--- a/gen/com/ibm/VPD/meson.build
+++ b/gen/com/ibm/VPD/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/VPD__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/VPD.errors.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/VPD.errors.yaml',  ],
     output: [ 'error.cpp', 'error.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/VPD',
     ],
 )
@@ -15,13 +15,13 @@
 subdir('Manager')
 generated_others += custom_target(
     'com/ibm/VPD/Manager__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/VPD/Manager.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/VPD/Manager.interface.yaml',  ],
     output: [ 'Manager.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/VPD/Manager',
     ],
     build_by_default: true,
diff --git a/gen/com/ibm/ipzvpd/CP00/meson.build b/gen/com/ibm/ipzvpd/CP00/meson.build
index 14c0029..dce80e4 100644
--- a/gen/com/ibm/ipzvpd/CP00/meson.build
+++ b/gen/com/ibm/ipzvpd/CP00/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/CP00__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/CP00.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/CP00.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/CP00',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/CRP0/meson.build b/gen/com/ibm/ipzvpd/CRP0/meson.build
index e0052e9..ab5ea7c 100644
--- a/gen/com/ibm/ipzvpd/CRP0/meson.build
+++ b/gen/com/ibm/ipzvpd/CRP0/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/CRP0__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/CRP0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/CRP0.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/CRP0',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/DINF/meson.build b/gen/com/ibm/ipzvpd/DINF/meson.build
index e2a7979..c291b4f 100644
--- a/gen/com/ibm/ipzvpd/DINF/meson.build
+++ b/gen/com/ibm/ipzvpd/DINF/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/DINF__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/DINF.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/DINF.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/DINF',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP0/meson.build b/gen/com/ibm/ipzvpd/LRP0/meson.build
index 4c1dc86..f044baf 100644
--- a/gen/com/ibm/ipzvpd/LRP0/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP0/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP0__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP0.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP0',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP1/meson.build b/gen/com/ibm/ipzvpd/LRP1/meson.build
index 4eaf50b..93d3980 100644
--- a/gen/com/ibm/ipzvpd/LRP1/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP1/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP1__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP1.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP1.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP1',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP2/meson.build b/gen/com/ibm/ipzvpd/LRP2/meson.build
index 9e7e8a2..972ee30 100644
--- a/gen/com/ibm/ipzvpd/LRP2/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP2/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP2__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP2.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP2.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP2',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP3/meson.build b/gen/com/ibm/ipzvpd/LRP3/meson.build
index a16504a..9a65389 100644
--- a/gen/com/ibm/ipzvpd/LRP3/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP3/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP3__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP3.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP3.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP3',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP4/meson.build b/gen/com/ibm/ipzvpd/LRP4/meson.build
index a952841..bb9cc09 100644
--- a/gen/com/ibm/ipzvpd/LRP4/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP4/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP4__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP4.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP4.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP4',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP5/meson.build b/gen/com/ibm/ipzvpd/LRP5/meson.build
index 89f21ba..2a38af7 100644
--- a/gen/com/ibm/ipzvpd/LRP5/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP5/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP5__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP5.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP5.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP5',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP6/meson.build b/gen/com/ibm/ipzvpd/LRP6/meson.build
index e757d94..2c8381c 100644
--- a/gen/com/ibm/ipzvpd/LRP6/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP6/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP6__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP6.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP6.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP6',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LRP7/meson.build b/gen/com/ibm/ipzvpd/LRP7/meson.build
index 87b9ad0..02b801e 100644
--- a/gen/com/ibm/ipzvpd/LRP7/meson.build
+++ b/gen/com/ibm/ipzvpd/LRP7/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LRP7__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP7.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP7.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP7',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP0/meson.build b/gen/com/ibm/ipzvpd/LWP0/meson.build
index 1569af8..8b58e1f 100644
--- a/gen/com/ibm/ipzvpd/LWP0/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP0/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP0__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP0.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP0',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP1/meson.build b/gen/com/ibm/ipzvpd/LWP1/meson.build
index 1562bbc..148f0b5 100644
--- a/gen/com/ibm/ipzvpd/LWP1/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP1/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP1__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP1.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP1.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP1',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP2/meson.build b/gen/com/ibm/ipzvpd/LWP2/meson.build
index f1894a3..8e688a1 100644
--- a/gen/com/ibm/ipzvpd/LWP2/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP2/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP2__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP2.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP2.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP2',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP3/meson.build b/gen/com/ibm/ipzvpd/LWP3/meson.build
index d88c91d..0715300 100644
--- a/gen/com/ibm/ipzvpd/LWP3/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP3/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP3__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP3.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP3.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP3',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP4/meson.build b/gen/com/ibm/ipzvpd/LWP4/meson.build
index 51887e9..0c6b44e 100644
--- a/gen/com/ibm/ipzvpd/LWP4/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP4/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP4__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP4.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP4.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP4',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP5/meson.build b/gen/com/ibm/ipzvpd/LWP5/meson.build
index 0cfd689..237a98d 100644
--- a/gen/com/ibm/ipzvpd/LWP5/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP5/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP5__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP5.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP5.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP5',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP6/meson.build b/gen/com/ibm/ipzvpd/LWP6/meson.build
index a97b11a..21c0c0b 100644
--- a/gen/com/ibm/ipzvpd/LWP6/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP6/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP6__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP6.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP6.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP6',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LWP7/meson.build b/gen/com/ibm/ipzvpd/LWP7/meson.build
index 99875e4..6731490 100644
--- a/gen/com/ibm/ipzvpd/LWP7/meson.build
+++ b/gen/com/ibm/ipzvpd/LWP7/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LWP7__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP7.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP7.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP7',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/LXR0/meson.build b/gen/com/ibm/ipzvpd/LXR0/meson.build
index 40e5921..1d77709 100644
--- a/gen/com/ibm/ipzvpd/LXR0/meson.build
+++ b/gen/com/ibm/ipzvpd/LXR0/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/LXR0__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LXR0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LXR0.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LXR0',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/Location/meson.build b/gen/com/ibm/ipzvpd/Location/meson.build
index 9a3ae6e..56e59cb 100644
--- a/gen/com/ibm/ipzvpd/Location/meson.build
+++ b/gen/com/ibm/ipzvpd/Location/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/Location__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/Location.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/Location.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/Location',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/MER0/meson.build b/gen/com/ibm/ipzvpd/MER0/meson.build
index ae68d0b..3d5a3c0 100644
--- a/gen/com/ibm/ipzvpd/MER0/meson.build
+++ b/gen/com/ibm/ipzvpd/MER0/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/MER0__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/MER0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/MER0.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/MER0',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/UTIL/meson.build b/gen/com/ibm/ipzvpd/UTIL/meson.build
index d507550..230445b 100644
--- a/gen/com/ibm/ipzvpd/UTIL/meson.build
+++ b/gen/com/ibm/ipzvpd/UTIL/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/UTIL__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/UTIL.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/UTIL.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/UTIL',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VCEN/meson.build b/gen/com/ibm/ipzvpd/VCEN/meson.build
index d516d9d..65373d8 100644
--- a/gen/com/ibm/ipzvpd/VCEN/meson.build
+++ b/gen/com/ibm/ipzvpd/VCEN/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VCEN__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VCEN.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VCEN.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VCEN',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VCFG/meson.build b/gen/com/ibm/ipzvpd/VCFG/meson.build
index cacdc53..ecaeda0 100644
--- a/gen/com/ibm/ipzvpd/VCFG/meson.build
+++ b/gen/com/ibm/ipzvpd/VCFG/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VCFG__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VCFG.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VCFG.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VCFG',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VEIR/meson.build b/gen/com/ibm/ipzvpd/VEIR/meson.build
index 4517bba..7775e54 100644
--- a/gen/com/ibm/ipzvpd/VEIR/meson.build
+++ b/gen/com/ibm/ipzvpd/VEIR/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VEIR__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VEIR.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VEIR.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VEIR',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VER0/meson.build b/gen/com/ibm/ipzvpd/VER0/meson.build
index b428d8d..b282c7b 100644
--- a/gen/com/ibm/ipzvpd/VER0/meson.build
+++ b/gen/com/ibm/ipzvpd/VER0/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VER0__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VER0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VER0.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VER0',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VINI/meson.build b/gen/com/ibm/ipzvpd/VINI/meson.build
index 7cfc061..37e60bb 100644
--- a/gen/com/ibm/ipzvpd/VINI/meson.build
+++ b/gen/com/ibm/ipzvpd/VINI/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VINI__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VINI.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VINI.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VINI',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VMPU/meson.build b/gen/com/ibm/ipzvpd/VMPU/meson.build
index d796e1b..69c8952 100644
--- a/gen/com/ibm/ipzvpd/VMPU/meson.build
+++ b/gen/com/ibm/ipzvpd/VMPU/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VMPU__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VMPU.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VMPU.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VMPU',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VMSC/meson.build b/gen/com/ibm/ipzvpd/VMSC/meson.build
index 40eea40..3805e18 100644
--- a/gen/com/ibm/ipzvpd/VMSC/meson.build
+++ b/gen/com/ibm/ipzvpd/VMSC/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VMSC__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VMSC.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VMSC.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VMSC',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VPRI/meson.build b/gen/com/ibm/ipzvpd/VPRI/meson.build
index bf410cc..d476c49 100644
--- a/gen/com/ibm/ipzvpd/VPRI/meson.build
+++ b/gen/com/ibm/ipzvpd/VPRI/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VPRI__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VPRI.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VPRI.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VPRI',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VR10/meson.build b/gen/com/ibm/ipzvpd/VR10/meson.build
index 558bed8..45ac513 100644
--- a/gen/com/ibm/ipzvpd/VR10/meson.build
+++ b/gen/com/ibm/ipzvpd/VR10/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VR10__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VR10.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VR10.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VR10',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VRML/meson.build b/gen/com/ibm/ipzvpd/VRML/meson.build
index b0017b5..d23ecc7 100644
--- a/gen/com/ibm/ipzvpd/VRML/meson.build
+++ b/gen/com/ibm/ipzvpd/VRML/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VRML__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VRML.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VRML.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VRML',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VRTN/meson.build b/gen/com/ibm/ipzvpd/VRTN/meson.build
index f4b0acc..25c91ea 100644
--- a/gen/com/ibm/ipzvpd/VRTN/meson.build
+++ b/gen/com/ibm/ipzvpd/VRTN/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VRTN__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VRTN.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VRTN.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VRTN',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VSBP/meson.build b/gen/com/ibm/ipzvpd/VSBP/meson.build
index 1b660c4..e437a71 100644
--- a/gen/com/ibm/ipzvpd/VSBP/meson.build
+++ b/gen/com/ibm/ipzvpd/VSBP/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VSBP__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VSBP.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VSBP.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VSBP',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VSRC/meson.build b/gen/com/ibm/ipzvpd/VSRC/meson.build
index 4a4c036..656d949 100644
--- a/gen/com/ibm/ipzvpd/VSRC/meson.build
+++ b/gen/com/ibm/ipzvpd/VSRC/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VSRC__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VSRC.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VSRC.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VSRC',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VSYS/meson.build b/gen/com/ibm/ipzvpd/VSYS/meson.build
index df7325c..875ff56 100644
--- a/gen/com/ibm/ipzvpd/VSYS/meson.build
+++ b/gen/com/ibm/ipzvpd/VSYS/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VSYS__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VSYS.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VSYS.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VSYS',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VW10/meson.build b/gen/com/ibm/ipzvpd/VW10/meson.build
index 5029940..ba3c802 100644
--- a/gen/com/ibm/ipzvpd/VW10/meson.build
+++ b/gen/com/ibm/ipzvpd/VW10/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VW10__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VW10.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VW10.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VW10',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/VWML/meson.build b/gen/com/ibm/ipzvpd/VWML/meson.build
index efb8c4a..bf0a910 100644
--- a/gen/com/ibm/ipzvpd/VWML/meson.build
+++ b/gen/com/ibm/ipzvpd/VWML/meson.build
@@ -1,13 +1,13 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'com/ibm/ipzvpd/VWML__cpp'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VWML.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VWML.interface.yaml',  ],
     output: [ 'server.cpp', 'server.hpp', 'client.hpp',  ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'cpp',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VWML',
     ],
 )
diff --git a/gen/com/ibm/ipzvpd/meson.build b/gen/com/ibm/ipzvpd/meson.build
index cace174..c1878a2 100644
--- a/gen/com/ibm/ipzvpd/meson.build
+++ b/gen/com/ibm/ipzvpd/meson.build
@@ -2,13 +2,13 @@
 subdir('CP00')
 generated_others += custom_target(
     'com/ibm/ipzvpd/CP00__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/CP00.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/CP00.interface.yaml',  ],
     output: [ 'CP00.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/CP00',
     ],
     build_by_default: true,
@@ -17,13 +17,13 @@
 subdir('CRP0')
 generated_others += custom_target(
     'com/ibm/ipzvpd/CRP0__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/CRP0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/CRP0.interface.yaml',  ],
     output: [ 'CRP0.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/CRP0',
     ],
     build_by_default: true,
@@ -32,13 +32,13 @@
 subdir('DINF')
 generated_others += custom_target(
     'com/ibm/ipzvpd/DINF__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/DINF.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/DINF.interface.yaml',  ],
     output: [ 'DINF.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/DINF',
     ],
     build_by_default: true,
@@ -47,13 +47,13 @@
 subdir('LRP0')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP0__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP0.interface.yaml',  ],
     output: [ 'LRP0.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP0',
     ],
     build_by_default: true,
@@ -62,13 +62,13 @@
 subdir('LRP1')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP1__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP1.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP1.interface.yaml',  ],
     output: [ 'LRP1.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP1',
     ],
     build_by_default: true,
@@ -77,13 +77,13 @@
 subdir('LRP2')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP2__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP2.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP2.interface.yaml',  ],
     output: [ 'LRP2.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP2',
     ],
     build_by_default: true,
@@ -92,13 +92,13 @@
 subdir('LRP3')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP3__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP3.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP3.interface.yaml',  ],
     output: [ 'LRP3.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP3',
     ],
     build_by_default: true,
@@ -107,13 +107,13 @@
 subdir('LRP4')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP4__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP4.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP4.interface.yaml',  ],
     output: [ 'LRP4.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP4',
     ],
     build_by_default: true,
@@ -122,13 +122,13 @@
 subdir('LRP5')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP5__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP5.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP5.interface.yaml',  ],
     output: [ 'LRP5.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP5',
     ],
     build_by_default: true,
@@ -137,13 +137,13 @@
 subdir('LRP6')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP6__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP6.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP6.interface.yaml',  ],
     output: [ 'LRP6.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP6',
     ],
     build_by_default: true,
@@ -152,13 +152,13 @@
 subdir('LRP7')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LRP7__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LRP7.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LRP7.interface.yaml',  ],
     output: [ 'LRP7.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LRP7',
     ],
     build_by_default: true,
@@ -167,13 +167,13 @@
 subdir('LWP0')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP0__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP0.interface.yaml',  ],
     output: [ 'LWP0.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP0',
     ],
     build_by_default: true,
@@ -182,13 +182,13 @@
 subdir('LWP1')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP1__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP1.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP1.interface.yaml',  ],
     output: [ 'LWP1.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP1',
     ],
     build_by_default: true,
@@ -197,13 +197,13 @@
 subdir('LWP2')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP2__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP2.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP2.interface.yaml',  ],
     output: [ 'LWP2.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP2',
     ],
     build_by_default: true,
@@ -212,13 +212,13 @@
 subdir('LWP3')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP3__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP3.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP3.interface.yaml',  ],
     output: [ 'LWP3.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP3',
     ],
     build_by_default: true,
@@ -227,13 +227,13 @@
 subdir('LWP4')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP4__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP4.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP4.interface.yaml',  ],
     output: [ 'LWP4.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP4',
     ],
     build_by_default: true,
@@ -242,13 +242,13 @@
 subdir('LWP5')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP5__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP5.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP5.interface.yaml',  ],
     output: [ 'LWP5.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP5',
     ],
     build_by_default: true,
@@ -257,13 +257,13 @@
 subdir('LWP6')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP6__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP6.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP6.interface.yaml',  ],
     output: [ 'LWP6.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP6',
     ],
     build_by_default: true,
@@ -272,13 +272,13 @@
 subdir('LWP7')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LWP7__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LWP7.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LWP7.interface.yaml',  ],
     output: [ 'LWP7.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LWP7',
     ],
     build_by_default: true,
@@ -287,13 +287,13 @@
 subdir('LXR0')
 generated_others += custom_target(
     'com/ibm/ipzvpd/LXR0__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/LXR0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/LXR0.interface.yaml',  ],
     output: [ 'LXR0.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/LXR0',
     ],
     build_by_default: true,
@@ -302,13 +302,13 @@
 subdir('Location')
 generated_others += custom_target(
     'com/ibm/ipzvpd/Location__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/Location.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/Location.interface.yaml',  ],
     output: [ 'Location.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/Location',
     ],
     build_by_default: true,
@@ -317,13 +317,13 @@
 subdir('MER0')
 generated_others += custom_target(
     'com/ibm/ipzvpd/MER0__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/MER0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/MER0.interface.yaml',  ],
     output: [ 'MER0.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/MER0',
     ],
     build_by_default: true,
@@ -332,13 +332,13 @@
 subdir('UTIL')
 generated_others += custom_target(
     'com/ibm/ipzvpd/UTIL__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/UTIL.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/UTIL.interface.yaml',  ],
     output: [ 'UTIL.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/UTIL',
     ],
     build_by_default: true,
@@ -347,13 +347,13 @@
 subdir('VCEN')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VCEN__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VCEN.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VCEN.interface.yaml',  ],
     output: [ 'VCEN.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VCEN',
     ],
     build_by_default: true,
@@ -362,13 +362,13 @@
 subdir('VCFG')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VCFG__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VCFG.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VCFG.interface.yaml',  ],
     output: [ 'VCFG.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VCFG',
     ],
     build_by_default: true,
@@ -377,13 +377,13 @@
 subdir('VEIR')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VEIR__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VEIR.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VEIR.interface.yaml',  ],
     output: [ 'VEIR.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VEIR',
     ],
     build_by_default: true,
@@ -392,13 +392,13 @@
 subdir('VER0')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VER0__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VER0.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VER0.interface.yaml',  ],
     output: [ 'VER0.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VER0',
     ],
     build_by_default: true,
@@ -407,13 +407,13 @@
 subdir('VINI')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VINI__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VINI.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VINI.interface.yaml',  ],
     output: [ 'VINI.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VINI',
     ],
     build_by_default: true,
@@ -422,13 +422,13 @@
 subdir('VMPU')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VMPU__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VMPU.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VMPU.interface.yaml',  ],
     output: [ 'VMPU.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VMPU',
     ],
     build_by_default: true,
@@ -437,13 +437,13 @@
 subdir('VMSC')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VMSC__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VMSC.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VMSC.interface.yaml',  ],
     output: [ 'VMSC.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VMSC',
     ],
     build_by_default: true,
@@ -452,13 +452,13 @@
 subdir('VPRI')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VPRI__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VPRI.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VPRI.interface.yaml',  ],
     output: [ 'VPRI.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VPRI',
     ],
     build_by_default: true,
@@ -467,13 +467,13 @@
 subdir('VR10')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VR10__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VR10.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VR10.interface.yaml',  ],
     output: [ 'VR10.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VR10',
     ],
     build_by_default: true,
@@ -482,13 +482,13 @@
 subdir('VRML')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VRML__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VRML.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VRML.interface.yaml',  ],
     output: [ 'VRML.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VRML',
     ],
     build_by_default: true,
@@ -497,13 +497,13 @@
 subdir('VRTN')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VRTN__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VRTN.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VRTN.interface.yaml',  ],
     output: [ 'VRTN.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VRTN',
     ],
     build_by_default: true,
@@ -512,13 +512,13 @@
 subdir('VSBP')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VSBP__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VSBP.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VSBP.interface.yaml',  ],
     output: [ 'VSBP.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VSBP',
     ],
     build_by_default: true,
@@ -527,13 +527,13 @@
 subdir('VSRC')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VSRC__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VSRC.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VSRC.interface.yaml',  ],
     output: [ 'VSRC.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VSRC',
     ],
     build_by_default: true,
@@ -542,13 +542,13 @@
 subdir('VSYS')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VSYS__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VSYS.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VSYS.interface.yaml',  ],
     output: [ 'VSYS.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VSYS',
     ],
     build_by_default: true,
@@ -557,13 +557,13 @@
 subdir('VW10')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VW10__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VW10.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VW10.interface.yaml',  ],
     output: [ 'VW10.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VW10',
     ],
     build_by_default: true,
@@ -572,13 +572,13 @@
 subdir('VWML')
 generated_others += custom_target(
     'com/ibm/ipzvpd/VWML__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/ipzvpd/VWML.interface.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/ipzvpd/VWML.interface.yaml',  ],
     output: [ 'VWML.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/ipzvpd/VWML',
     ],
     build_by_default: true,
diff --git a/gen/com/ibm/meson.build b/gen/com/ibm/meson.build
index f02aa97..cec211b 100644
--- a/gen/com/ibm/meson.build
+++ b/gen/com/ibm/meson.build
@@ -4,13 +4,13 @@
 subdir('VPD')
 generated_others += custom_target(
     'com/ibm/VPD__markdown'.underscorify(),
-    input: [ meson.source_root() / 'com/ibm/VPD.errors.yaml',  ],
+    input: [ meson.project_source_root() / 'com/ibm/VPD.errors.yaml',  ],
     output: [ 'VPD.md' ],
     command: [
         sdbuspp_gen_meson_prog, '--command', 'markdown',
         '--output', meson.current_build_dir(),
         '--tool', sdbusplusplus_prog,
-        '--directory', meson.source_root(),
+        '--directory', meson.project_source_root(),
         'com/ibm/VPD',
     ],
     build_by_default: true,