[Bf-committers] build blender with mingw

[Antony Riakiotakis]

I am extremely proud to announce I have the first working build of
blender built with MinGW64 :)

The problem is with pyextensions, look at http://bugs.python.org/issue4709

The solution is to define MS_WIN64 when building with MinGW64.

Caleb, can you please verify?

Also, I still get the issues with OpenEXR and changing the MSYS didn't
help. I don't think this is the problem because it works with normal
MinGW. Also, trying different versions of MSYS also didn't help. I
suspect it is an issue with the string length when calling the make
script or something similar. In any case, building with the same
compiler shouldn't affect the result so can you please give direct me
to your build to test? It would be convenient if you can provide your
configuration scripts as well.

OpenEXR is very important because it is needed for OpenImageIO.