--- a/make/MacBundles.gmk	Tue Feb 05 10:24:39 2019 +0100
+++ b/make/MacBundles.gmk	Tue Feb 05 14:57:24 2019 +0100
@@ -30,7 +30,7 @@
 default: bundles
 
 # Only macosx has bundles defined.
-ifeq ($(OPENJDK_TARGET_OS), macosx)
+ifeq ($(call isTargetOs, macosx), true)
 
   bundles: jre-bundle jdk-bundle