Quote Originally Posted by DerVerbrecher View Post
1.) qwt compiled with mingw32 in DEBUG-Mode:
"Cannot load library C:/Qwt-6.1.0-rc3/plugins/designer/qwt_designer_plugin.dll: Die angegebene Prozedur wurde nicht gefunden"
As the creator is build in release mode you can't load a designer plugin ( or lib ) that has been built in debug mode. So this combination doesn't make any sense at all ( beside you want to debug the creator ).

Quote Originally Posted by DerVerbrecher View Post
2.) qwt compiled with mingw32 in RELEASE-Mode:
"Cannot load library C:/Qwt-6.1.0-rc3/plugins/designer/qwt_designer_plugin.dll: verwendet eine inkompatible Qt-Bibliothek. (Im Debug-Modus erstellte und im Release-Modus erstellte Bibliotheken können nicht zusammen verwendet werden.)
The message tells you that you are trying to mix debug/release libs. Guess the creator has been built in release mode - so it must be the designer plugin or the Qwt lib that has been built in debug mode.

I recommend to throw away what you have so far and rebuild with the default settings in qwtconfig.pri - what is debug_and_release on Windows.

Uwe