QtCreator set wrong prefix (QLibraryInfo::PrefixPath)

QtCreator set wrong prefix (QLibraryInfo::PrefixPath).

When I start my program from QtCreator I got prefix "/home/berlin/dev/qt-45" (and plugins doesn't work).
But I run my program from command line prefix is ok.

Example code:

 
int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);
	qDebug() <<	QLibraryInfo::buildDate();
	qDebug() <<	QLibraryInfo::buildKey();
	qDebug() <<	QLibraryInfo::location(QLibraryInfo::PrefixPath);
	qDebug() <<	QLibraryInfo::location(QLibraryInfo::PluginsPath);
}

Running this from QtCreator I got:

QDate("wt. cze 8 2010")
"i386 linux g++-4 full-config"
"/home/berlin/dev/qt-45"
"/home/berlin/dev/qt-45/plugins"

Workaround is to create qt.conf inside app dir (not QtCreator dir) pointing to proper prefix.