Hi Rene, i used win32con.bat
btw - mame compile without problem with win32con.bat
2 PS - Rene i'm champion :)))
now compile with conemu , all is fine.
start my bat environment with "./ my.bat"
and revised my environment !!
many tnx for your helpthe last edit:
Rene now rebuild qmc2 from scratch , absolutly clean build .
Take all dlls from msys64 / share / qt4
but not found folder "imageformats"