--- a/make/common/JdkNativeCompilation.gmk	Wed Mar 14 12:50:43 2018 +0100
+++ b/make/common/JdkNativeCompilation.gmk	Wed Mar 14 21:52:48 2018 +0100
@@ -107,6 +107,8 @@
     $1_RC_FLAGS :=
   endif
 
+  $1_RC_FLAGS += $$($1_EXTRA_RC_FLAGS)
+
   # Since we reuse the rule name ($1), all our arguments will pass through.
   # We lose in transparency, but gain in brevity in this call...
   $$(eval $$(call SetupNativeCompilation, $1, ))