Okay,
Here in Qt Centre I found this wiki article:
http://www.qtcentre.org/wiki/index.p...ws_using_MinGW
When I compare what I've done with this article, I find the files "qsqlpsql4.dll" and "qsqlpsqld4.dll" in the folder "%QTDIR%\plugins\sqldrivers".
If I load the "qsqlpsql4.dll" with the dependency walker I get the information that there are a few files missing (libpq.dll, mingwm10.dll, libgcc_s_dw2-1.dll, qtcore4.dll, qtsql4.dll).
Tomorrow I'll try to update my enviromental variable paths.
Please tell me if I'm completly wrong.
Greetings
Bookmarks