@remax: the MACHINE variable is automatically set from 'gcc -dumpmachine' on Windows (MinGW), and x86_64 is the correct architecture for 64-bit on x86, also commonly called x64 on Windows, or w64 in case of MinGW (probably just to confuse the Russians... oh, that's from a different time smile ).

A mind is like a parachute. It doesn't work unless it's open. [Frank Zappa]