Index: ps/trunk/libraries/source/spidermonkey/FixMacBuild.diff
===================================================================
--- ps/trunk/libraries/source/spidermonkey/FixMacBuild.diff	(revision 26189)
+++ ps/trunk/libraries/source/spidermonkey/FixMacBuild.diff	(revision 26190)
@@ -1,24 +1,35 @@
 --- a/build/moz.configure/toolchain.configure
 +++ b/build/moz.configure/toolchain.configure
 @@ -1619,8 +1619,9 @@
          # Initialize local variables with a 0xAA pattern in clang debug builds.
          # Linux32 fails some xpcshell tests with -ftrivial-auto-var-init
          linux32 = target.kernel == 'Linux' and target.cpu == 'x86'
 +        mac = target.kernel == 'Darwin'
          if (c_compiler.type == 'clang' or c_compiler.type == 'clang-cl') and \
 -            c_compiler.version >= '8' and debug and not linux32:
 +            c_compiler.version >= '8' and debug and not linux32 and not mac:
              if c_compiler.type == 'clang-cl':
                  flags.append('-Xclang')
                  js_flags.append('-Xclang')
 --- a/build/moz.configure/toolchain.configure
 +++ b/build/moz.configure/toolchain.configure
-@@ -141,7 +141,7 @@
+@@ -141,7 +141,6 @@
      @imports(_from='biplist', _import='readPlist')
      def macos_sdk(sdk, host):
          sdk_min_version = Version('10.11')
 -        sdk_max_version = Version('10.15.4')
-+        sdk_max_version = Version('11.99')
  
          if sdk:
-             sdk = sdk[0]
\ No newline at end of file
+             sdk = sdk[0]
+@@ -170,11 +169,6 @@
+                 'You may need to point to it using --with-macos-sdk=<path> in your '
+                 'mozconfig. Various SDK versions are available from '
+                 'https://github.com/phracker/MacOSX-SDKs' % (version, sdk_min_version))
+-        if version > sdk_max_version:
+-            die('SDK version "%s" is unsupported. Please downgrade to version '
+-                '%s. You may need to point to it using --with-macos-sdk=<path> in '
+-                'your mozconfig. Various SDK versions are available from '
+-                'https://github.com/phracker/MacOSX-SDKs' % (version, sdk_max_version))
+         return sdk
+ 
+     set_config('MACOS_SDK_DIR', macos_sdk)
\ No newline at end of file