diff -r 8a3fe0ae06a8 -r e64f2cb57d05 common/autoconf/build-aux/config.guess
--- a/common/autoconf/build-aux/config.guess	Wed Oct 24 13:11:42 2012 -0700
+++ b/common/autoconf/build-aux/config.guess	Fri Oct 26 14:29:57 2012 -0700
@@ -48,6 +48,9 @@
 
 # Test and fix cygwin on x86_64
 echo $OUT | grep 86-pc-cygwin > /dev/null 2> /dev/null
+if test $? != 0; then
+  echo $OUT | grep 86-pc-mingw > /dev/null 2> /dev/null
+fi
 if test $? = 0; then
   case `echo $PROCESSOR_IDENTIFIER | cut -f1 -d' '` in
     intel64|Intel64|INTEL64|em64t|EM64T|amd64|AMD64|8664|x86_64)