diff -r e177cddcbf77 -r 82c3ae69914f make/lib/Lib-java.prefs.gmk
--- a/make/lib/Lib-java.prefs.gmk	Mon Apr 16 14:51:31 2018 +0200
+++ b/make/lib/Lib-java.prefs.gmk	Wed Apr 18 14:22:53 2018 +0200
@@ -39,7 +39,8 @@
     SRC := $(LIBPREF_SRC_DIRS), \
     OPTIMIZATION := HIGH, \
     CFLAGS := $(CFLAGS_JDKLIB), \
-    HEADER_FLAGS := $(LIBJAVA_HEADER_FLAGS), \
+    HEADER_FLAGS := \
+        -I$(call FindHeaderDirForModule, $(MODULE)), \
     LDFLAGS := $(LDFLAGS_JDKLIB) \
         $(call SET_SHARED_LIBRARY_ORIGIN), \
     LIBS_unix := -ljvm, \