diff --git a/unum/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go b/unum/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go
new file mode 100644
index 0000000..0711d3d
--- /dev/null
+++ b/unum/vendor/golang.org/x/net/ipv4/sys_asmreqn_stub.go
@@ -0,0 +1,21 @@
+// Copyright 2014 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,!freebsd,!linux
+
+package ipv4
+
+import (
+	"net"
+
+	"golang.org/x/net/internal/socket"
+)
+
+func (so *sockOpt) getIPMreqn(c *socket.Conn) (*net.Interface, error) {
+	return nil, errOpNoSupport
+}
+
+func (so *sockOpt) setIPMreqn(c *socket.Conn, ifi *net.Interface, grp net.IP) error {
+	return errOpNoSupport
+}