--- M2Crypto-0.24.0/setup.py.orig	2017-04-24 01:52:50.368912266 +0200
+++ M2Crypto-0.24.0/setup.py	2017-04-24 01:53:45.223167325 +0200
@@ -91,7 +91,7 @@
 
             # For RedHat-based distros, the '-D__{arch}__' option for
             # Swig needs to be normalized, particularly on i386.
-            mach = platform.machine().lower()
+            mach = os.getenv('__SWIG_CPU_ARCH', platform.machine().lower())
             if mach in ('i386', 'i486', 'i586', 'i686'):
                 arch = '__i386__'
             elif mach in ('ppc64', 'powerpc64'):