--- a/make/lib/Lib-jdk.pack.gmk	Fri May 04 01:17:28 2018 +0200
+++ b/make/lib/Lib-jdk.pack.gmk	Fri May 04 01:31:12 2018 +0200
@@ -32,7 +32,7 @@
     EXTRA_SRC := common-unpack, \
     TOOLCHAIN := TOOLCHAIN_LINK_CXX, \
     OPTIMIZATION := LOW, \
-    CXXFLAGS := $(CXXFLAGS_JDKLIB) \
+    CFLAGS := $(CXXFLAGS_JDKLIB) \
         -DNO_ZLIB -DUNPACK_JNI -DFULL, \
     CFLAGS_release := -DPRODUCT, \
     EXTRA_HEADER_DIRS := $(call GetJavaHeaderDir, java.base), \