Last gyp patch for cross-platform Unix support

third_party/libpng/libpng.gyp

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
-      [ 'OS=="linux" or OS=="freebsd" or OS=="openbsd"', {
+      [ 'os_posix == 1 and OS != "mac"', {
         # Link to system .so since we already use it due to GTK.
         'use_system_libpng%': 1,
-      }, {  # OS!="linux" and OS!="freebsd" and OS!="openbsd"
+      }, {  # os_posix != 1 or OS == "mac"
         'use_system_libpng%': 0,
       }],
     ],
   },
   'conditions': [
     ['use_system_libpng==0', {
       'targets': [
         {
           'target_name': 'libpng',
           'type': '<(component)',
@@ skipping 94 matching lines @@
       ],
     }],
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: