qmake: Defining 2 conditions for the same instruction

If I add two nested conditions in myproject.pro like this:

unix {
    contains(DEFINES, K_DEBUG) {
        SUBDIRS += debug
    }
}

The instruction is never executed even if the conditions are true. But if I remove the indentation blank spaces like this:

unix {
contains(DEFINES, K_DEBUG) {
         SUBDIRS += debug
}
}

Then it works. I think the syntax analyzer of qmake should be more flexible.

Thanks!

PS: The text editor of the bug tracker doesn't allow me to show the problem in an accurate way, so please, visit this link: http://qt-project.org/forums/viewthread/51650