diff --git a/src/meson.build b/src/meson.build
index bdb8f67..a59cffd 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -13,8 +13,32 @@
   fmt_dep = fmt_proj.dependency('fmt')
 endif
 
+# Function2 might not have a pkg-config. It is header only so just make
+# sure we can access the needed symbols from the header.
+function2_dep = dependency('function2', required: false)
+has_function2 = meson.get_compiler('cpp').has_header_symbol(
+    'function2/function2.hpp',
+    'fu2::unique_function',
+    dependencies: function2_dep,
+    required: false
+)
+if not has_function2
+    function2_opts = import('cmake').subproject_options()
+    function2_opts.add_cmake_defines({'BUILD_TESTING': 'OFF'})
+    function2_proj = import('cmake').subproject(
+        'function2',
+        options: function2_opts,
+        required: false
+    )
+    assert(function2_proj.found(), 'function2 is required')
+    if function2_proj.found()
+        function2_dep = function2_proj.dependency('function2')
+    endif
+endif
+
 stdplus_deps = [
   fmt_dep,
+  function2_dep,
 ]
 
 stdplus_srcs = [