--- old/make/Main.gmk	2019-02-05 16:27:36.398742101 +0100
+++ new/make/Main.gmk	2019-02-05 16:27:36.218742100 +0100
@@ -1032,7 +1032,7 @@
   endif
 endif
 
-ifeq ($(OPENJDK_TARGET_OS), macosx)
+ifeq ($(call isTargetOs, macosx), true)
   product-images: mac-jdk-bundle
 endif