diff -Naur a/tools/gyp/pylib/gyp/xcode_emulation.py b/tools/gyp/pylib/gyp/xcode_emulation.py
--- a/tools/gyp/pylib/gyp/xcode_emulation.py	2014-01-23 06:05:51.000000000 +0100
+++ b/tools/gyp/pylib/gyp/xcode_emulation.py	2014-02-04 17:49:48.000000000 +0100
@@ -1018,12 +1033,16 @@
     # Since the value returned by this function is only used when ARCHS is not
     # set, then on iOS we return "i386", as the default xcode project generator
     # does not set ARCHS if it is not set in the .gyp file.
-    if self.isIOS:
+    
+    try:
+      if self.isIOS:
+        return 'i386'
+      version, build = self._XcodeVersion()
+      if version >= '0500':
+        return 'x86_64'
       return 'i386'
-    version, build = self._XcodeVersion()
-    if version >= '0500':
+    except:
       return 'x86_64'
-    return 'i386'
 
 class MacPrefixHeader(object):
   """A class that helps with emulating Xcode's GCC_PREFIX_HEADER feature.