Index: Lib/distutils/unixccompiler.py
===================================================================
--- Lib/distutils/unixccompiler.py	(revision 64165)
+++ Lib/distutils/unixccompiler.py	(working copy)
@@ -76,9 +76,8 @@
     if 'ARCHFLAGS' in os.environ and not stripArch:
         # User specified different -arch flags in the environ,
         # see also distutils.sysconfig
-        compiler_so = compiler_so + ' ' + os.environ['ARCHFLAGS']
+        compiler_so = compiler_so + os.environ['ARCHFLAGS'].split()
 
-
     if stripSysroot:
         try:
             index = compiler_so.index('-isysroot')