undefined reference to library after static compiling qt

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http://qt-project.org – Hey, i compiled qt for windows static wothout any error and if i compile and execute a programm with qt creator without libs it is working. But if i want to use the Qt libs and include them, it says i.e QCoreApplication was not declared. After adding them in the*.pro file it says undefined reference to them. pro file #————————————————————————- # Project created by QtCreator 2013-12-20T10:42:53 # #———&#82 (HowTos)