--- a/mingwmake.bat	Wed Jan 30 18:56:28 2013 +0100
+++ b/mingwmake.bat	Sat Feb 02 01:23:18 2013 +0100
@@ -5,4 +5,4 @@
 @REM -------
 
 @call ..\rules\find_mingw.bat
-make.exe -N -f bc.mak -DUSEMINGW64=1 %*
+make.exe -N -f bc.mak %USEMINGW_ARG% %*