diff -r 00776cd28457 -r a6cb200daa5d make/lib/Lib-java.prefs.gmk
--- a/make/lib/Lib-java.prefs.gmk	Thu Apr 26 15:37:22 2018 +0200
+++ b/make/lib/Lib-java.prefs.gmk	Thu Apr 26 15:52:17 2018 +0200
@@ -39,8 +39,6 @@
     SRC := $(LIBPREF_SRC_DIRS), \
     OPTIMIZATION := HIGH, \
     CFLAGS := $(CFLAGS_JDKLIB), \
-    HEADER_FLAGS := \
-        -I$(call FindHeaderDirForModule, $(MODULE)), \
     LDFLAGS := $(LDFLAGS_JDKLIB) \
         $(call SET_SHARED_LIBRARY_ORIGIN), \
     LIBS_unix := -ljvm, \