Just came across this advice on https://github.com/cython/cython/wiki/64BitCythonExtensionsOnWindows:

> Do not use MinGW-w64. As you will notice, the MinGW import library for
> Python (e.g. libpython27.a) is omitted from the AMD64 version of
> Python. This is deliberate. Do not try to make one using dlltool.
> There is no official MinGW-w64 release yet, it is still in "beta" and
> considered unstable, although you can get a 64-bit build from e.g.
> TDM-GCC. There have also been issues with the mingw runtime
> conflicting with the MSVC runtime; this can happen from places you
> don't expect, such as inside runtime libraries for g++ or gfortran. To
> stay on the safe side, avoid MinGW-w64 for now.

How accurate is this? Would we be better to omit the mingw libraries from the installer and instead provide the commands (or even a shell script?) to generate it with whatever toolset you're currently using?