I was able to install msys2 and compile the openFrameworks libs with following the instructions on the website. If I now compile an of example, a 32bit application is created. Can I somehow build a 64bit version? I used the C:\msys64\mingw32\bin\g++ to compile the OpenFarmeworks libs simply because the 64bit version silently failed. So I fear without 64bit libs I cannot build a 64bit application, is that correct?