CREATOR and Cmake do not find the Qt stuff path, during compilation under QT CREATOR

Latest QTSDK and Qt creator seems to be well installed in a Windows 7 environment ( Option->Qt4 has the correct autodetection), but Qt creator fail to find Qt stuff even if the path is provided in the system path (c:\QtSDK\Desktop\Qt\4.7.4\mingw\bin).
I'm recompiling an old app and everything was ok with previous versions of QT sdk.
I'm using the same Cmake text file for configuring the project in Qt creator 2.3.1.
Could be this a Qt related problem or a Cmake related problem?

Thanks in advance.

answering myself: installing the new sdk is important to erase all the previous Qt setting selecting the checkbox in the QT sdk installer.

as a side note: the incorrect path detection is a cmake bug: installing the 2.8.2 previous version everything is ok !!