Mingw build environment to build ffmpeg and other libraries Installation: extract msys.7z to c:\ edit c:\msys\etc\fstab if you installed it in a different directory edit c:\msys\msys.bat and adapt the path to vcvars32.bat (line 15) Open a shell: run c:\msys\msys.bat -rxvt Source: The environment was created like described here: http://ffmpeg.arrozcru.org/wiki/index.php?title=Main_Page