moreover, it seems that the mkspecs for qmake are not really named in a comprehensive way. for example you have linux-g++-32 and linux-g++-64 - but it is not obvious which architecture these mean? linux runs on a wide range of 32 and 64 bit operating architectures, ranging from intel (both 32 and 64 bit), sparc (both 32 and 64 bit), power, etc.

it might be that Qt itself is not ported to all of these, but for now I'm just looking at qmake as a cross-platform buiilding tool...