NOT USED NOW:

- install msys2, start mingw-msys2
- pacman -S git subversion mingw-w64-x86_64-gcc mingw-w64-x86_64-ninja mingw-w64-x86_64-cmake make mingw-w64-x86_64-python3
- git clone https://github.com/mstorsjo/llvm-mingw.git

build-all.sh:
./build-mingw-w64.sh $PREFIX --with-default-msvcrt=msvcrt

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