diff --git a/src/pkg/crypto/rand/rand_unix.go b/src/pkg/crypto/rand/rand_unix.go
index d9cddf6d2ad..5d4fc8198ac 100644
--- a/src/pkg/crypto/rand/rand_unix.go
+++ b/src/pkg/crypto/rand/rand_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Unix cryptographically secure pseudorandom number
 // generator.
diff --git a/src/pkg/mime/type_unix.go b/src/pkg/mime/type_unix.go
index 2950e7b4006..2dab1eac78d 100644
--- a/src/pkg/mime/type_unix.go
+++ b/src/pkg/mime/type_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd plan9
+// +build darwin freebsd linux netbsd openbsd plan9
 
 package mime
 
diff --git a/src/pkg/net/cgo_stub.go b/src/pkg/net/cgo_stub.go
index fbe6150c26b..4c49e63184c 100644
--- a/src/pkg/net/cgo_stub.go
+++ b/src/pkg/net/cgo_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build openbsd
+// +build netbsd openbsd
 
 // Stub cgo routines for systems that do not use cgo to do network lookups.
 
diff --git a/src/pkg/net/dnsclient_unix.go b/src/pkg/net/dnsclient_unix.go
index 79a958e3cd0..07e72ccb862 100644
--- a/src/pkg/net/dnsclient_unix.go
+++ b/src/pkg/net/dnsclient_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // DNS client: see RFC 1035.
 // Has to be linked into package net for Dial.
diff --git a/src/pkg/net/dnsconfig.go b/src/pkg/net/dnsconfig.go
index 379fec95b86..c0ab80288da 100644
--- a/src/pkg/net/dnsconfig.go
+++ b/src/pkg/net/dnsconfig.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Read system DNS config from /etc/resolv.conf
 
diff --git a/src/pkg/net/fd.go b/src/pkg/net/fd.go
index bcd04a0ad87..3dec9f4beb8 100644
--- a/src/pkg/net/fd.go
+++ b/src/pkg/net/fd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/src/pkg/net/file.go b/src/pkg/net/file.go
index bf8cd9dae04..4ac280bd1a3 100644
--- a/src/pkg/net/file.go
+++ b/src/pkg/net/file.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/src/pkg/net/interface_bsd.go b/src/pkg/net/interface_bsd.go
index e896d43c321..cdfb3dbd1e2 100644
--- a/src/pkg/net/interface_bsd.go
+++ b/src/pkg/net/interface_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // Network interface identification for BSD variants
 
diff --git a/src/pkg/net/iprawsock_posix.go b/src/pkg/net/iprawsock_posix.go
index d3cb38a6517..7bb4c7dc0d3 100644
--- a/src/pkg/net/iprawsock_posix.go
+++ b/src/pkg/net/iprawsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // (Raw) IP sockets
 
diff --git a/src/pkg/net/ipsock_posix.go b/src/pkg/net/ipsock_posix.go
index f0ca7dad345..d141c050b23 100644
--- a/src/pkg/net/ipsock_posix.go
+++ b/src/pkg/net/ipsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 package net
 
diff --git a/src/pkg/net/lookup_unix.go b/src/pkg/net/lookup_unix.go
index aae6d6ceb95..5c475477b83 100644
--- a/src/pkg/net/lookup_unix.go
+++ b/src/pkg/net/lookup_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/src/pkg/net/newpollserver.go b/src/pkg/net/newpollserver.go
index 035df4a6ff1..a410bb6ce1f 100644
--- a/src/pkg/net/newpollserver.go
+++ b/src/pkg/net/newpollserver.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package net
 
diff --git a/src/pkg/net/port.go b/src/pkg/net/port.go
index 80597f7555d..16780da1160 100644
--- a/src/pkg/net/port.go
+++ b/src/pkg/net/port.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Read system port mappings from /etc/services
 
diff --git a/src/pkg/net/sendfile_stub.go b/src/pkg/net/sendfile_stub.go
index b0adea47873..ff76ab9cf0e 100644
--- a/src/pkg/net/sendfile_stub.go
+++ b/src/pkg/net/sendfile_stub.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 package net
 
diff --git a/src/pkg/net/sock.go b/src/pkg/net/sock.go
index 777f204b186..dc073927eb4 100644
--- a/src/pkg/net/sock.go
+++ b/src/pkg/net/sock.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // Sockets
 
diff --git a/src/pkg/net/sock_bsd.go b/src/pkg/net/sock_bsd.go
index 7025edf7421..816e4fc3f74 100644
--- a/src/pkg/net/sock_bsd.go
+++ b/src/pkg/net/sock_bsd.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd openbsd
+// +build darwin freebsd netbsd openbsd
 
 // Sockets for BSD variants
 
diff --git a/src/pkg/net/udpsock_posix.go b/src/pkg/net/udpsock_posix.go
index c25ec9c506a..6bb15714e2b 100644
--- a/src/pkg/net/udpsock_posix.go
+++ b/src/pkg/net/udpsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // UDP sockets
 
diff --git a/src/pkg/net/unixsock_posix.go b/src/pkg/net/unixsock_posix.go
index 929f6409a4f..10632c1412e 100644
--- a/src/pkg/net/unixsock_posix.go
+++ b/src/pkg/net/unixsock_posix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd windows
+// +build darwin freebsd linux netbsd openbsd windows
 
 // Unix domain sockets
 
diff --git a/src/pkg/path/filepath/path_unix.go b/src/pkg/path/filepath/path_unix.go
index daf0eb2af7c..c5ac71efe21 100644
--- a/src/pkg/path/filepath/path_unix.go
+++ b/src/pkg/path/filepath/path_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package filepath
 
diff --git a/src/pkg/time/sys_unix.go b/src/pkg/time/sys_unix.go
index 55ae5f7da28..56a7414e0ce 100644
--- a/src/pkg/time/sys_unix.go
+++ b/src/pkg/time/sys_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 package time
 
diff --git a/src/pkg/time/zoneinfo_unix.go b/src/pkg/time/zoneinfo_unix.go
index 83d5b983c6e..540b653c57d 100644
--- a/src/pkg/time/zoneinfo_unix.go
+++ b/src/pkg/time/zoneinfo_unix.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// +build darwin freebsd linux openbsd
+// +build darwin freebsd linux netbsd openbsd
 
 // Parse "zoneinfo" time zone file.
 // This is a fairly standard file format used on OS X, Linux, BSD, Sun, and others.