diff --git a/make/common/shared/Defs.gmk b/make/common/shared/Defs.gmk
index ca55564560e3b4886f728a71fe1c3aec4d957930..43e27a5a4cad0c74eba59fea728c04c953e9e5e2 100644
--- a/make/common/shared/Defs.gmk
+++ b/make/common/shared/Defs.gmk
@@ -287,9 +287,12 @@ ifdef BUILD_NUMBER
   FULL_VERSION = $(RELEASE)-$(BUILD_NUMBER)
 else
   BUILD_NUMBER = b00
-  BUILD_DATE := $(shell $(DATE) '+%Y_%m_%d_%H_%M')
-  CLEAN_USERNAME := $(shell $(ECHO) "$(USER)" | $(TR) -d -c '[:alnum:]')
-  USER_RELEASE_SUFFIX := $(shell $(ECHO) "$(CLEAN_USERNAME)_$(BUILD_DATE)" | $(TR) '[:upper:]' '[:lower:]' )
+  ifndef USER_RELEASE_SUFFIX
+    BUILD_DATE := $(shell $(DATE) '+%Y_%m_%d_%H_%M')
+    CLEAN_USERNAME := $(shell $(ECHO) "$(USER)" | $(TR) -d -c '[:alnum:]')
+    USER_RELEASE_SUFFIX := $(shell $(ECHO) "$(CLEAN_USERNAME)_$(BUILD_DATE)" | $(TR) '[:upper:]' '[:lower:]' )
+  endif
+  export USER_RELEASE_SUFFIX
   FULL_VERSION = $(RELEASE)-$(USER_RELEASE_SUFFIX)-$(BUILD_NUMBER)
 endif
 
@@ -335,7 +338,9 @@ endif
 
 # Include any private definitions for this set of workspaces
 _PRIVATE_DEFS_FILE=$(JDK_MAKE_SHARED_DIR)/PrivateDefs.gmk
-USING_PRIVATE_DEFS:=$(shell if [ -f $(_PRIVATE_DEFS_FILE) ]; then echo true; else echo false; fi)
+ifeq ($(USING_PRIVATE_DEFS),)
+  USING_PRIVATE_DEFS:=$(shell if [ -f $(_PRIVATE_DEFS_FILE) ]; then echo true; else echo false; fi)
+endif
 ifeq ($(USING_PRIVATE_DEFS),true)
 dummy:=$(warning "WARNING: Using definitions from $(_PRIVATE_DEFS_FILE)")
 include $(_PRIVATE_DEFS_FILE)
diff --git a/make/jprt.gmk b/make/jprt.gmk
index bd1189bf45e7a6de973efe6fdb7e89c4eb9bd0f5..3ad4c188243c6b3182cb75da035eb043a004d613 100644
--- a/make/jprt.gmk
+++ b/make/jprt.gmk
@@ -26,9 +26,6 @@
 # JPRT rule to build this workspace
 
 JPRT_ARCHIVE_BUNDLE=$(ABS_OUTPUTDIR)/$(JPRT_BUILD_FLAVOR)-bundle.zip
-ifdef JPRT_BUILD_VERSION
-  MILESTONE=$(JPRT_BUILD_VERSION)
-endif
 
 jprt_build_product:  all images
 	( $(CD) $(OUTPUTDIR)/j2sdk-image && \