@Alex: I do. it’s almost the same besides i my path says …\4.8.1\msvc2010\qmake.exe and there is a waring telling me the toolchain for this version could not be created.
@babylon: Thanks. that was it! I thought i could write and test apps without specifying what OS i want to target, but now that i think about it, it doesn’t really make sense.
Thank you. Problem solved!