--- old/make/lib/Lib-jdk.net.gmk	2018-03-23 14:24:06.025158106 +0100
+++ new/make/lib/Lib-jdk.net.gmk	2018-03-23 14:24:05.797158107 +0100
@@ -34,7 +34,6 @@
       SRC := $(TOPDIR)/src/jdk.net/$(OPENJDK_TARGET_OS)/native/libextnet, \
       OPTIMIZATION := LOW, \
       CFLAGS := $(CFLAGS_JDKLIB) -I$(SUPPORT_OUTPUTDIR)/headers/jdk.net, \
-      MAPFILE := $(TOPDIR)/make/mapfiles/libextnet/mapfile-$(OPENJDK_TARGET_OS), \
       LDFLAGS := $(LDFLAGS_JDKLIB) \
           $(call SET_SHARED_LIBRARY_ORIGIN), \
       LIBS := -ljava, \