diff --git a/app/app.go b/app/app.go
index 84a7ace..df5368f 100644
--- a/app/app.go
+++ b/app/app.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux darwin
+
 package app
 
 import (
diff --git a/font/font.go b/font/font.go
index 2c27980..ed1cf3e 100644
--- a/font/font.go
+++ b/font/font.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux darwin
+
 // Package font provides platform independent access to system fonts.
 package font
 
diff --git a/gl/gendebug.go b/gl/gendebug.go
index 10f378f..dcfd8ac 100644
--- a/gl/gendebug.go
+++ b/gl/gendebug.go
@@ -11,8 +11,8 @@ package main
 
 import (
 	"bytes"
-	"fmt"
 	"flag"
+	"fmt"
 	"go/ast"
 	"go/format"
 	"go/parser"
@@ -221,6 +221,7 @@ const preamble = `// Copyright 2014 The Go Authors.  All rights reserved.
 // Generated from gl.go using go generate. DO NOT EDIT.
 // See doc.go for details.
 
+// +build linux darwin
 // +build gldebug
 
 package gl
diff --git a/gl/gl.go b/gl/gl.go
index 704d1fc..697825d 100644
--- a/gl/gl.go
+++ b/gl/gl.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux darwin
 // +build !gldebug
 
 package gl
diff --git a/gl/gldebug.go b/gl/gldebug.go
index 505872b..c5b5f2d 100644
--- a/gl/gldebug.go
+++ b/gl/gldebug.go
@@ -5,6 +5,7 @@
 // Generated from gl.go using go generate. DO NOT EDIT.
 // See doc.go for details.
 
+// +build linux darwin
 // +build gldebug
 
 package gl
diff --git a/gl/types_common.go b/gl/types_common.go
index 878626f..facf9c7 100644
--- a/gl/types_common.go
+++ b/gl/types_common.go
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux darwin
+
 package gl
 
 // This file contains GL Types and their methods that are independent of the
diff --git a/gl/types_debug.go b/gl/types_debug.go
index 2f0eb2f..f9c5183 100644
--- a/gl/types_debug.go
+++ b/gl/types_debug.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux darwin
 // +build gldebug
 
 package gl
diff --git a/gl/types_prod.go b/gl/types_prod.go
index cb3207b..34def2a 100644
--- a/gl/types_prod.go
+++ b/gl/types_prod.go
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+// +build linux darwin
 // +build !gldebug
 
 package gl