--- /dev/null
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !darwin,!dragonfly,!freebsd,!netbsd,!openbsd,!solaris,!windows
+
+package ipv4
+
+import (
+ "net"
+
+ "golang.org/x/net/internal/socket"
+)
+
+func (so *sockOpt) setIPMreq(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
+ return errOpNoSupport
+}
+
+func (so *sockOpt) getMulticastIf(c *socket.Conn) (*net.Interface, error) {
+ return nil, errOpNoSupport
+}
+
+func (so *sockOpt) setMulticastIf(c *socket.Conn, ifi *net.Interface) error {
+ return errOpNoSupport
+}