QtCreator can you do a make -j5
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You can specify it in Project mode. Simply add argument to make step.
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This is also answered in the "Qt Creator FAQ":http://developer.qt.nokia.com/wiki/QtCreatorFAQ here on the wiki. Seems that this is not prominent enough on the wiki's entry page.
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Also look at this thread: http://developer.qt.nokia.com/forums/viewthread/1831