--- a/mingwmake.bat	Wed Mar 20 19:27:07 2013 +0100
+++ b/mingwmake.bat	Fri Mar 22 10:49:52 2013 +0100
@@ -4,5 +4,7 @@
 @REM do not edit - automatically generated from ProjectDefinition
 @REM -------
 
-@call $(TOP)\rules\find_mingw.bat
+@pushd ..\rules
+@call find_mingw.bat
+@popd
 make.exe -N -f bc.mak %USEMINGW_ARG% %*