How do I target win32-arm?

Trying to build static target win32-arm for unsupported Windows 8.1 RT in test mode (aka desktop program). How do build for this?

I've read about installing mingw crossover for Linux, but they all seem to target win32 x86 & x86_64. How do I target win32 arm (armv7a)?

Do I have to rebuild mingw crossover for arm?

Thanks and kind regards!