diff --git a/gotools/ChangeLog b/gotools/ChangeLog
index cc3af21243d..5746d2c725f 100644
--- a/gotools/ChangeLog
+++ b/gotools/ChangeLog
@@ -1,3 +1,10 @@
+2015-01-15  Ian Lance Taylor  <iant@google.com>
+
+	* configure.ac: Check for networking libraries; see NET_LIBS.
+	* Makefile.am (go$(EXEEXT)): Link against NET_LIBS.
+	(gofmt$(EXEEXT), cgo$(EXEEXT)): Likewise.
+	* configure, Makefile.in: Rebuild.
+
 2015-01-14  Ian Lance Taylor  <iant@google.com>
 
 	* Makefile.am (go_cmd_go_files): Sort entries.  Add generate.go.
diff --git a/gotools/Makefile.am b/gotools/Makefile.am
index 5f129f89df9..41802efb891 100644
--- a/gotools/Makefile.am
+++ b/gotools/Makefile.am
@@ -108,11 +108,11 @@ bin_PROGRAMS = go$(EXEEXT) gofmt$(EXEEXT)
 libexecsub_PROGRAMS = cgo$(EXEEXT)
 
 go$(EXEEXT): $(go_cmd_go_files) zdefaultcc.go $(LIBGODEP)
-	$(GOLINK) $(go_cmd_go_files) zdefaultcc.go
+	$(GOLINK) $(go_cmd_go_files) zdefaultcc.go $(NET_LIBS)
 gofmt$(EXEEXT): $(go_cmd_gofmt_files) $(LIBGODEP)
-	$(GOLINK) $(go_cmd_gofmt_files)
+	$(GOLINK) $(go_cmd_gofmt_files) $(NET_LIBS)
 cgo$(EXEEXT): $(go_cmd_cgo_files) zdefaultcc.go $(LIBGODEP)
-	$(GOLINK) $(go_cmd_cgo_files) zdefaultcc.go
+	$(GOLINK) $(go_cmd_cgo_files) zdefaultcc.go $(NET_LIBS)
 
 else
 
diff --git a/gotools/Makefile.in b/gotools/Makefile.in
index 20458bdf9b0..295c68d9844 100644
--- a/gotools/Makefile.in
+++ b/gotools/Makefile.in
@@ -122,6 +122,7 @@ LTLIBOBJS = @LTLIBOBJS@
 MAINT = @MAINT@
 MAKEINFO = @MAKEINFO@
 MKDIR_P = @MKDIR_P@
+NET_LIBS = @NET_LIBS@
 OBJEXT = @OBJEXT@
 PACKAGE = @PACKAGE@
 PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
@@ -589,11 +590,11 @@ s-zdefaultcc: Makefile
 	$(STAMP) $@ 
 
 @NATIVE_TRUE@go$(EXEEXT): $(go_cmd_go_files) zdefaultcc.go $(LIBGODEP)
-@NATIVE_TRUE@	$(GOLINK) $(go_cmd_go_files) zdefaultcc.go
+@NATIVE_TRUE@	$(GOLINK) $(go_cmd_go_files) zdefaultcc.go $(NET_LIBS)
 @NATIVE_TRUE@gofmt$(EXEEXT): $(go_cmd_gofmt_files) $(LIBGODEP)
-@NATIVE_TRUE@	$(GOLINK) $(go_cmd_gofmt_files)
+@NATIVE_TRUE@	$(GOLINK) $(go_cmd_gofmt_files) $(NET_LIBS)
 @NATIVE_TRUE@cgo$(EXEEXT): $(go_cmd_cgo_files) zdefaultcc.go $(LIBGODEP)
-@NATIVE_TRUE@	$(GOLINK) $(go_cmd_cgo_files) zdefaultcc.go
+@NATIVE_TRUE@	$(GOLINK) $(go_cmd_cgo_files) zdefaultcc.go $(NET_LIBS)
 
 # For a non-native build we have to build the programs using a
 # previously built host (or build -> host) Go compiler.  We should
diff --git a/gotools/configure b/gotools/configure
index 5cb16552819..bc9332e1ed2 100755
--- a/gotools/configure
+++ b/gotools/configure
@@ -555,6 +555,7 @@ ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
 LIBOBJS
+NET_LIBS
 NATIVE_FALSE
 NATIVE_TRUE
 GOCFLAGS
@@ -1423,6 +1424,119 @@ fi
   return $ac_retval
 
 } # ac_fn_c_try_compile
+
+# ac_fn_c_try_link LINENO
+# -----------------------
+# Try to link conftest.$ac_ext, and return whether this succeeded.
+ac_fn_c_try_link ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  rm -f conftest.$ac_objext conftest$ac_exeext
+  if { { ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval ac_try_echo="\"\$as_me:${as_lineno-$LINENO}: $ac_try_echo\""
+$as_echo "$ac_try_echo"; } >&5
+  (eval "$ac_link") 2>conftest.err
+  ac_status=$?
+  if test -s conftest.err; then
+    grep -v '^ *+' conftest.err >conftest.er1
+    cat conftest.er1 >&5
+    mv -f conftest.er1 conftest.err
+  fi
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; } && {
+	 test -z "$ac_c_werror_flag" ||
+	 test ! -s conftest.err
+       } && test -s conftest$ac_exeext && {
+	 test "$cross_compiling" = yes ||
+	 $as_test_x conftest$ac_exeext
+       }; then :
+  ac_retval=0
+else
+  $as_echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	ac_retval=1
+fi
+  # Delete the IPA/IPO (Inter Procedural Analysis/Optimization) information
+  # created by the PGI compiler (conftest_ipa8_conftest.oo), as it would
+  # interfere with the next link command; also delete a directory that is
+  # left behind by Apple's compiler.  We do this before executing the actions.
+  rm -rf conftest.dSYM conftest_ipa8_conftest.oo
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+  return $ac_retval
+
+} # ac_fn_c_try_link
+
+# ac_fn_c_check_func LINENO FUNC VAR
+# ----------------------------------
+# Tests whether FUNC exists, setting the cache variable VAR accordingly
+ac_fn_c_check_func ()
+{
+  as_lineno=${as_lineno-"$1"} as_lineno_stack=as_lineno_stack=$as_lineno_stack
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $2" >&5
+$as_echo_n "checking for $2... " >&6; }
+if { as_var=$3; eval "test \"\${$as_var+set}\" = set"; }; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+/* Define $2 to an innocuous variant, in case <limits.h> declares $2.
+   For example, HP-UX 11i <limits.h> declares gettimeofday.  */
+#define $2 innocuous_$2
+
+/* System header to define __stub macros and hopefully few prototypes,
+    which can conflict with char $2 (); below.
+    Prefer <limits.h> to <assert.h> if __STDC__ is defined, since
+    <limits.h> exists even on freestanding compilers.  */
+
+#ifdef __STDC__
+# include <limits.h>
+#else
+# include <assert.h>
+#endif
+
+#undef $2
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char $2 ();
+/* The GNU C library defines this for functions which it implements
+    to always fail with ENOSYS.  Some functions are actually named
+    something starting with __ and the normal name is an alias.  */
+#if defined __stub_$2 || defined __stub___$2
+choke me
+#endif
+
+int
+main ()
+{
+return $2 ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  eval "$3=yes"
+else
+  eval "$3=no"
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+eval ac_res=\$$3
+	       { $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_res" >&5
+$as_echo "$ac_res" >&6; }
+  eval $as_lineno_stack; test "x$as_lineno_stack" = x && { as_lineno=; unset as_lineno;}
+
+} # ac_fn_c_check_func
 cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.
@@ -3675,6 +3789,124 @@ else
 fi
 
 
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for socket libraries" >&5
+$as_echo_n "checking for socket libraries... " >&6; }
+if test "${gotools_cv_lib_sockets+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  gotools_cv_lib_sockets=
+   gotools_check_both=no
+   ac_fn_c_check_func "$LINENO" "connect" "ac_cv_func_connect"
+if test "x$ac_cv_func_connect" = x""yes; then :
+  gotools_check_socket=no
+else
+  gotools_check_socket=yes
+fi
+
+   if test "$gotools_check_socket" = "yes"; then
+     unset ac_cv_func_connect
+     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lsocket" >&5
+$as_echo_n "checking for main in -lsocket... " >&6; }
+if test "${ac_cv_lib_socket_main+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lsocket  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+int
+main ()
+{
+return main ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_socket_main=yes
+else
+  ac_cv_lib_socket_main=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_socket_main" >&5
+$as_echo "$ac_cv_lib_socket_main" >&6; }
+if test "x$ac_cv_lib_socket_main" = x""yes; then :
+  gotools_cv_lib_sockets="-lsocket"
+else
+  gotools_check_both=yes
+fi
+
+   fi
+   if test "$gotools_check_both" = "yes"; then
+     gotools_old_libs=$LIBS
+     LIBS="$LIBS -lsocket -lnsl"
+     unset ac_cv_func_accept
+     ac_fn_c_check_func "$LINENO" "accept" "ac_cv_func_accept"
+if test "x$ac_cv_func_accept" = x""yes; then :
+  gotools_check_nsl=no
+		    gotools_cv_lib_sockets="-lsocket -lnsl"
+fi
+
+     unset ac_cv_func_accept
+     LIBS=$gotools_old_libs
+   fi
+   unset ac_cv_func_gethostbyname
+   gotools_old_libs="$LIBS"
+   ac_fn_c_check_func "$LINENO" "gethostbyname" "ac_cv_func_gethostbyname"
+if test "x$ac_cv_func_gethostbyname" = x""yes; then :
+
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for main in -lnsl" >&5
+$as_echo_n "checking for main in -lnsl... " >&6; }
+if test "${ac_cv_lib_nsl_main+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnsl  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+
+int
+main ()
+{
+return main ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nsl_main=yes
+else
+  ac_cv_lib_nsl_main=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nsl_main" >&5
+$as_echo "$ac_cv_lib_nsl_main" >&6; }
+if test "x$ac_cv_lib_nsl_main" = x""yes; then :
+  gotools_cv_lib_sockets="$gotools_cv_lib_sockets -lnsl"
+fi
+
+fi
+
+   unset ac_cv_func_gethostbyname
+   LIBS=$gotools_old_libs
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gotools_cv_lib_sockets" >&5
+$as_echo "$gotools_cv_lib_sockets" >&6; }
+NET_LIBS="$gotools_cv_lib_sockets"
+
+
 ac_config_files="$ac_config_files Makefile"
 
 
diff --git a/gotools/configure.ac b/gotools/configure.ac
index ddc26fbcbe5..24f4498d279 100644
--- a/gotools/configure.ac
+++ b/gotools/configure.ac
@@ -48,6 +48,37 @@ AC_PROG_GO
 
 AM_CONDITIONAL(NATIVE, test "$cross_compiling" = no)
 
+dnl Test for -lsocket and -lnsl.  Copied from libjava/configure.ac.
+AC_CACHE_CHECK([for socket libraries], gotools_cv_lib_sockets,
+  [gotools_cv_lib_sockets=
+   gotools_check_both=no
+   AC_CHECK_FUNC(connect, gotools_check_socket=no, gotools_check_socket=yes)
+   if test "$gotools_check_socket" = "yes"; then
+     unset ac_cv_func_connect
+     AC_CHECK_LIB(socket, main, gotools_cv_lib_sockets="-lsocket",
+     		  gotools_check_both=yes)
+   fi
+   if test "$gotools_check_both" = "yes"; then
+     gotools_old_libs=$LIBS
+     LIBS="$LIBS -lsocket -lnsl"
+     unset ac_cv_func_accept
+     AC_CHECK_FUNC(accept,
+		   [gotools_check_nsl=no
+		    gotools_cv_lib_sockets="-lsocket -lnsl"])
+     unset ac_cv_func_accept
+     LIBS=$gotools_old_libs
+   fi
+   unset ac_cv_func_gethostbyname
+   gotools_old_libs="$LIBS"
+   AC_CHECK_FUNC(gethostbyname, ,
+		 [AC_CHECK_LIB(nsl, main,
+		 	[gotools_cv_lib_sockets="$gotools_cv_lib_sockets -lnsl"])])
+   unset ac_cv_func_gethostbyname
+   LIBS=$gotools_old_libs
+])
+NET_LIBS="$gotools_cv_lib_sockets"
+AC_SUBST(NET_LIBS)
+
 AC_CONFIG_FILES(Makefile)
 
 AC_OUTPUT