At the present, there are a few issues that prevent Concord from working properly on Mingw64 or Msys2. The first issue is neither environment's libcurl implementation will natively fetch SSL certificates from the Windows SSL root chain by default. There is a way to rectify this, but it is rather inopportune and should not be done. However, neither environment can easily link against a Windows-native MSVC-compiled version of libcurl. This is due to object file differences. It is possible, but highly unrecommended to use Mingw64 or Msys2. Please consider using Cygwin instead.