diff --git a/build/external_code.gypi b/build/external_code.gypi
new file mode 100644
index 0000000..83a790d
--- /dev/null
+++ b/build/external_code.gypi
@@ -0,0 +1,50 @@
+# Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+
+# This is included for external code which may require different warning
+# settings than the internal WebRTC code.
+
+# TODO(ajm): remove these when possible.
+{
+  'conditions': [
+    ['OS=="linux"', {
+      'target_defaults': {
+        'cflags!': [
+          '-Wall',
+          '-Wextra',
+          '-Werror',
+        ],
+      },
+    }],
+    ['OS=="win"', {
+      'target_defaults': {
+        'defines': [
+          '_CRT_SECURE_NO_DEPRECATE',
+          '_CRT_NONSTDC_NO_WARNINGS',
+          '_CRT_NONSTDC_NO_DEPRECATE',
+          '_SCL_SECURE_NO_DEPRECATE',
+        ],
+        'msvs_disabled_warnings': [4800],
+        'msvs_settings': {
+          'VCCLCompilerTool': {
+            'WarnAsError': 'false',
+            'Detect64BitPortabilityProblems': 'false',
+          },
+        },
+      },
+    }],
+    ['OS=="mac"', {
+      'target_defaults': {
+        'xcode_settings': {
+          'GCC_TREAT_WARNINGS_AS_ERRORS': 'NO',
+          'WARNING_CFLAGS!': ['-Wall'],
+        },
+      },
+    }],
+  ],
+}