--- old/make/lib/Lib-java.prefs.gmk	2018-06-08 10:48:36.127893626 +0200
+++ new/make/lib/Lib-java.prefs.gmk	2018-06-08 10:48:35.819893628 +0200
@@ -27,18 +27,16 @@
 
 ################################################################################
 
+# libprefs on macosx do not use the unix code
 ifeq ($(OPENJDK_TARGET_OS), macosx)
-  LIBPREF_SRC_DIRS := $(TOPDIR)/src/java.prefs/macosx/native/libprefs
-else
-  LIBPREF_SRC_DIRS := $(TOPDIR)/src/java.prefs/$(OPENJDK_TARGET_OS_TYPE)/native/libprefs
+  LIBPREFS_EXCLUDE_SRC_PATTERNS := unix
 endif
 
 $(eval $(call SetupJdkLibrary, BUILD_LIBPREFS, \
     NAME := prefs, \
-    SRC := $(LIBPREF_SRC_DIRS), \
+    EXCLUDE_SRC_PATTERNS := $(LIBPREFS_EXCLUDE_SRC_PATTERNS), \
     OPTIMIZATION := HIGH, \
-    CFLAGS := $(CFLAGS_JDKLIB) $(addprefix -I, $(LIBPREF_SRC_DIRS)) \
-        $(LIBJAVA_HEADER_FLAGS), \
+    CFLAGS := $(CFLAGS_JDKLIB), \
     LDFLAGS := $(LDFLAGS_JDKLIB) \
         $(call SET_SHARED_LIBRARY_ORIGIN), \
     LIBS_unix := -ljvm, \