--- numpy-1.10.1/numpy/distutils/fcompiler/gnu.py	2015-10-14 21:43:39.834732663 +0200
+++ numpy-1.10.1/numpy/distutils/fcompiler/gnu.py.orig	2015-10-14 21:42:31.346540506 +0200
@@ -218,7 +218,7 @@
                 opt = ['-O2 -march=core2 -mtune=generic -mfpmath=sse -msse2 '
                        '-mincoming-stack-boundary=2']
             else:
-                opt = ['-O2']
+                opt = ['-O2 -march=x86-64 -DMS_WIN64 -mtune=generic -msse2']
         else:
             opt = ['-O2']