I would like Qt Creator to build the project according to the type I specify in the little computer button.

Using:

CONFIG(debug, debug|release)
{
    DESTDIR = Debug
    OBJECTS_DIR = Debug/.obj
    MOC_DIR = Debug/.moc
    RCC_DIR = Debug/.rcc
    UI_DIR = Debug/.ui
}

CONFIG(release, debug|release)
{
    DESTDIR = Release
    OBJECTS_DIR = Release/.obj
    MOC_DIR = Release/.moc
    RCC_DIR = Release/.rcc
    UI_DIR = Release/.ui
}

Or, using the answer from here, makes qmake chose the last time a variable was defined.

How do I set it?

Thnx

P.S I don't know if it has something to do with my problem, but I'm using Ubuntu and not Windows