This adds a stub for the mac installer so that the gyp generation won't fail ...

installer/mac/installer.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': {
+    'chromium_code': 1,
+    'nppversion': '<!(python ../../plugin/version_info.py --commaversion)',
+    'dotnppversion': '<!(python ../../plugin/version_info.py --version)',
+
+    # We don't actually want the extras version to update by itself;
+    # it should change only when we actually add something to the
+    # installer or change the d3dx9 version.  This version is
+    # therefore independent of the o3d plugin and sdk versions.
+    'extrasversion': '0,1,1,0',
+    'dotextrasversion': '0.1.1.0',
+  },
+  'includes': [
+    '../../build/common.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'installer',
+      'type': 'none',
+      'dependencies': [
+        '../../converter/converter.gyp:o3dConverter',
+        '../../breakpad/breakpad.gyp:reporter',
+        '../../google_update/google_update.gyp:getextras',
+        '../../documentation/documentation.gyp:*',
+        '../../plugin/plugin.gyp:npo3dautoplugin',
+        '../../samples/samples.gyp:samples',
+      ],
+    },
+  ],
+}