diff --git a/openpower/package/hostboot-binaries/hostboot_binaries.mk b/openpower/package/hostboot-binaries/hostboot_binaries.mk
index 332110c..0e3f087 100644
--- a/openpower/package/hostboot-binaries/hostboot_binaries.mk
+++ b/openpower/package/hostboot-binaries/hostboot_binaries.mk
@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-HOSTBOOT_BINARIES_VERSION = da5ca565422d157e7225d3f20c7ff06f63610f49
-HOSTBOOT_BINARIES_SITE = $(call github,open-power,hostboot-binaries,$(HOSTBOOT_BINARIES_VERSION))
+HOSTBOOT_BINARIES_VERSION ?= da5ca565422d157e7225d3f20c7ff06f63610f49
+HOSTBOOT_BINARIES_SITE ?= $(call github,open-power,hostboot-binaries,$(HOSTBOOT_BINARIES_VERSION))
 HOSTBOOT_BINARIES_LICENSE = Apache-2.0
 
 HOSTBOOT_BINARIES_INSTALL_IMAGES = YES
diff --git a/openpower/package/hostboot/hostboot.mk b/openpower/package/hostboot/hostboot.mk
index ea219d5..71140c9 100644
--- a/openpower/package/hostboot/hostboot.mk
+++ b/openpower/package/hostboot/hostboot.mk
@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-HOSTBOOT_VERSION = 1300dc02979646be65a39097f86a559cf68bcfb7
-HOSTBOOT_SITE = $(call github,open-power,hostboot,$(HOSTBOOT_VERSION))
+HOSTBOOT_VERSION ?= 1300dc02979646be65a39097f86a559cf68bcfb7
+HOSTBOOT_SITE ?= $(call github,open-power,hostboot,$(HOSTBOOT_VERSION))
 HOSTBOOT_LICENSE = Apache-2.0
 HOSTBOOT_DEPENDENCIES = host-binutils
 
diff --git a/openpower/package/openpower-ffs/openpower-ffs.mk b/openpower/package/openpower-ffs/openpower-ffs.mk
index 3a3ea2d..1e6b9bf 100644
--- a/openpower/package/openpower-ffs/openpower-ffs.mk
+++ b/openpower/package/openpower-ffs/openpower-ffs.mk
@@ -1,5 +1,5 @@
-OPENPOWER_FFS_VERSION = bf4630076762d9c20c16c80c1c791f352b046dd1
-OPENPOWER_FFS_SITE = $(call github,open-power,ffs,$(OPENPOWER_FFS_VERSION))
+OPENPOWER_FFS_VERSION ?= bf4630076762d9c20c16c80c1c791f352b046dd1
+OPENPOWER_FFS_SITE ?= $(call github,open-power,ffs,$(OPENPOWER_FFS_VERSION))
 OPENPOWER_FFS_LICENSE = GPLv2+
 
 define HOST_OPENPOWER_FFS_BUILD_CMDS
diff --git a/openpower/package/openpower-pnor/openpower-pnor.mk b/openpower/package/openpower-pnor/openpower-pnor.mk
index c9e73fe..d6a9472 100644
--- a/openpower/package/openpower-pnor/openpower-pnor.mk
+++ b/openpower/package/openpower-pnor/openpower-pnor.mk
@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-OPENPOWER_PNOR_VERSION = 0855f1b9683e13583248a64454fe13fb02fd1b87
-OPENPOWER_PNOR_SITE = $(call github,open-power,pnor,$(OPENPOWER_PNOR_VERSION))
+OPENPOWER_PNOR_VERSION ?= 0855f1b9683e13583248a64454fe13fb02fd1b87
+OPENPOWER_PNOR_SITE ?= $(call github,open-power,pnor,$(OPENPOWER_PNOR_VERSION))
 OPENPOWER_PNOR_LICENSE = Apache-2.0
 OPENPOWER_PNOR_DEPENDENCIES = hostboot hostboot-binaries openpower-targeting skiboot host-openpower-ffs
 
diff --git a/openpower/package/openpower-targeting/openpower-targeting.mk b/openpower/package/openpower-targeting/openpower-targeting.mk
index 800a383..63e9918 100644
--- a/openpower/package/openpower-targeting/openpower-targeting.mk
+++ b/openpower/package/openpower-targeting/openpower-targeting.mk
@@ -4,8 +4,8 @@
 #
 ################################################################################
 
-OPENPOWER_TARGETING_VERSION = adda3365283b7bcfcd1f19373b01acfc7669a84f
-OPENPOWER_TARGETING_SITE = $(call github,open-power,hostboot-targeting,$(OPENPOWER_TARGETING_VERSION))
+OPENPOWER_TARGETING_VERSION ?= adda3365283b7bcfcd1f19373b01acfc7669a84f
+OPENPOWER_TARGETING_SITE ?= $(call github,open-power,hostboot-targeting,$(OPENPOWER_TARGETING_VERSION))
 OPENPOWER_TARGETING_LICENSE = Apache-2.0
 OPENPOWER_TARGETING_DEPENDENCIES = hostboot-install-images