diff -r 259dffd8dabc -r fbfe06b70e16 make/lib/Lib-jdk.net.gmk
--- a/make/lib/Lib-jdk.net.gmk	Fri Nov 10 03:27:43 2017 +0000
+++ b/make/lib/Lib-jdk.net.gmk	Mon Nov 13 14:03:36 2017 +0530
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -35,7 +35,7 @@
       SRC := $(TOPDIR)/src/jdk.net/solaris/native/libextnet, \
       OPTIMIZATION := LOW, \
       CFLAGS := $(CFLAGS_JDKLIB) -I$(SUPPORT_OUTPUTDIR)/headers/jdk.net, \
-      MAPFILE := $(TOPDIR)/make/mapfiles/libextnet/mapfile-vers, \
+      MAPFILE := $(TOPDIR)/make/mapfiles/libextnet/mapfile-solaris, \
       LDFLAGS := $(LDFLAGS_JDKLIB) \
           $(call SET_SHARED_LIBRARY_ORIGIN), \
       LIBS := -lsocket -lc -ljava, \
@@ -48,4 +48,25 @@
 endif
 
 
+ifeq ($(OPENJDK_TARGET_OS), linux)
+
+  $(eval $(call SetupNativeCompilation, BUILD_LIBEXTNET, \
+      LIBRARY := extnet, \
+      OUTPUT_DIR := $(INSTALL_LIBRARIES_HERE), \
+      SRC := $(TOPDIR)/src/jdk.net/linux/native/libextnet, \
+      OPTIMIZATION := LOW, \
+      CFLAGS := $(CFLAGS_JDKLIB) -I$(SUPPORT_OUTPUTDIR)/headers/jdk.net, \
+      MAPFILE := $(TOPDIR)/make/mapfiles/libextnet/mapfile-linux, \
+      LDFLAGS := $(LDFLAGS_JDKLIB) \
+          $(call SET_SHARED_LIBRARY_ORIGIN), \
+      LIBS := -ljvm -ljava -lc, \
+      OBJECT_DIR := $(SUPPORT_OUTPUTDIR)/native/$(MODULE)/libextnet, \
+  ))
+
+  $(BUILD_LIBEXTNET): $(call FindLib, java.base, java)
+
+  TARGETS += $(BUILD_LIBEXTNET)
+endif
+
+
 ################################################################################