I'm especially interested in QMAKE_MKSPECS:

Code:
rene@marvin:~/src/qmc2> qmake -query | grep QMAKE_MKSPECS
QMAKE_MKSPECS:/usr/share/qt4/mkspecs

rene@marvin:~/src/qmc2> ls -al /usr/share/qt4/mkspecs | grep win32-g++
drwxr-xr-x   2 root root 4096 Jun  7 09:23 win32-g++
drwxr-xr-x   2 root root 4096 Jun  7 09:23 win32-g++-4.6


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