Explicitly only use xmldummy_mac.cc on Mac systems, since libxml (as...

third_party/libxml/libxml.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"', {'os_include': 'linux'}],
       ['OS=="mac"', {'os_include': 'mac'}],
       ['OS=="win"', {'os_include': 'win32'}],
@@ skipping 171 matching lines @@
             }],
           ],
         }],
       ],
     },
     {
       'target_name': 'xmlcatalog',
       'type': 'executable',
       'sources': [
         'xmlcatalog.c',
-        'xmldummy_mac.cc',
       ],
       'include_dirs': [
         '<(os_include)',
       ],
       'dependencies': [
         'libxml',
       ],
       'conditions': [
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-ldl',
               '-lm',
             ],
           },
         }],
+        ['OS=="mac"', {
+          'sources': [
+            'xmldummy_mac.cc',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'xmllint',
       'type': 'executable',
       'sources': [
         'xmllint.c',
-        'xmldummy_mac.cc',
       ],
       'include_dirs': [
         '<(os_include)',
       ],
       'dependencies': [
         'libxml',
         '../icu/icu.gyp:icuuc',
       ],
       'conditions': [
         ['OS=="linux"', {
           'link_settings': {
             'libraries': [
               '-ldl',
               '-lm',
             ],
           },
         }],
+        ['OS=="mac"', {
+          'sources': [
+            'xmldummy_mac.cc',
+          ],
+        }],
       ],
     },
   ],
 }