diff -r 71c04702a3d5 -r 72e3ae9a25eb make/lib/Lib-jdk.net.gmk
--- a/make/lib/Lib-jdk.net.gmk	Tue Sep 12 19:03:39 2017 +0200
+++ b/make/lib/Lib-jdk.net.gmk	Tue Sep 12 19:03:56 2017 +0200
@@ -32,10 +32,10 @@
   $(eval $(call SetupNativeCompilation, BUILD_LIBEXTNET, \
       LIBRARY := extnet, \
       OUTPUT_DIR := $(INSTALL_LIBRARIES_HERE), \
-      SRC := $(JDK_TOPDIR)/src/jdk.net/solaris/native/libextnet, \
+      SRC := $(TOPDIR)/src/jdk.net/solaris/native/libextnet, \
       OPTIMIZATION := LOW, \
       CFLAGS := $(CFLAGS_JDKLIB) -I$(SUPPORT_OUTPUTDIR)/headers/jdk.net, \
-      MAPFILE := $(JDK_TOPDIR)/make/mapfiles/libextnet/mapfile-vers, \
+      MAPFILE := $(TOPDIR)/make/mapfiles/libextnet/mapfile-vers, \
       LDFLAGS := $(LDFLAGS_JDKLIB) \
           $(call SET_SHARED_LIBRARY_ORIGIN), \
       LIBS := -lsocket -lc -ljava, \