--- old/jdk/make/lib/Awt2dLibraries.gmk	2016-07-01 17:48:49.588133063 +0200
+++ new/jdk/make/lib/Awt2dLibraries.gmk	2016-07-01 17:48:49.432126465 +0200
@@ -23,6 +23,8 @@
 # questions.
 #
 
+$(eval $(call IncludeCustomExtension, jdk, lib/Awt2dLibraries-pre.gmk))
+
 WIN_AWT_LIB := $(SUPPORT_OUTPUTDIR)/native/$(MODULE)/libawt/awt.lib
 
 ################################################################################
@@ -212,11 +214,7 @@
     LIBAWT_CFLAGS += -DMLIB_OS64BIT
   endif
 
-  ifdef OPENJDK
-    LIBAWT_RC_FLAGS := -I $(JDK_TOPDIR)/src/java.base/windows/native/launcher/icons
-  else
-    LIBAWT_RC_FLAGS := -I $(JDK_TOPDIR)/src/closed/java.base/windows/native/launcher/icons
-  endif
+  LIBAWT_RC_FLAGS ?= -I $(JDK_TOPDIR)/src/java.base/windows/native/launcher/icons
   LIBAWT_VERSIONINFO_RESOURCE := $(JDK_TOPDIR)/src/java.desktop/windows/native/libawt/windows/awt.rc
 endif
 
@@ -454,13 +452,6 @@
 
 ################################################################################
 
-ifdef OPENJDK
-  BUILD_LIBJAVAJPEG_MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libjpeg/mapfile-vers
-else
-  BUILD_LIBJAVAJPEG_MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libjpeg/mapfile-vers-closed
-  LIBJAVAJPEG_SRC += $(JDK_TOPDIR)/src/closed/java.desktop/share/native/libjavajpeg
-endif
-
 LIBJAVAJPEG_SRC += $(JDK_TOPDIR)/src/java.desktop/share/native/libjavajpeg
 
 BUILD_LIBJAVAJPEG_REORDER :=
@@ -510,7 +501,7 @@
     DISABLED_WARNINGS_gcc := clobbered parentheses array-bounds, \
     DISABLED_WARNINGS_clang := logical-op-parentheses, \
     DISABLED_WARNINGS_microsoft := 4267, \
-    MAPFILE := $(BUILD_LIBJAVAJPEG_MAPFILE), \
+    MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libjpeg/mapfile-vers, \
     LDFLAGS := $(LDFLAGS_JDKLIB) \
         $(call SET_SHARED_LIBRARY_ORIGIN), \
     LIBS := $(LIBJPEG_LIBS) $(JDKLIB_LIBS), \
@@ -645,15 +636,10 @@
 
 #### End harfbuzz configuration
 
-ifndef OPENJDK
-  LIBFONTMANAGER_CFLAGS += -I$(JDK_TOPDIR)/src/closed/java.desktop/share/native/libt2k
-  BUILD_LIBFONTMANAGER_MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libfontmanager/mapfile-vers
-  LIBFONTMANAGER_EXCLUDE_FILES += freetypeScaler.c
-else
-  LIBFONTMANAGER_CFLAGS += $(FREETYPE_CFLAGS)
-  BUILD_LIBFONTMANAGER_MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libfontmanager/mapfile-vers.openjdk
-  BUILD_LIBFONTMANAGER_FONTLIB := $(FREETYPE_LIBS)
-endif
+LIBFONTMANAGER_CFLAGS += $(FREETYPE_CFLAGS)
+# This may be overridden in a custom makefile
+BUILD_LIBFONTMANAGER_MAPFILE ?= $(JDK_TOPDIR)/make/mapfiles/libfontmanager/mapfile-vers
+BUILD_LIBFONTMANAGER_FONTLIB += $(FREETYPE_LIBS)
 
 LIBFONTMANAGER_OPTIMIZATION := HIGH