--- /dev/null
+--- a/engine/SCons/Platform/__init__.py
++++ b/engine/SCons/Platform/__init__.py
+@@ -63,6 +63,8 @@ def platform_default():
+ care about the machine architecture.
+ """
+ osname = os.name
++ if 'PLATFORM' in os.environ:
++ return os.environ['PLATFORM']
+ if osname == 'java':
+ osname = os._osType
+ if osname == 'posix':