Error on installing qt sdk on mac 10.6.2
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Before going to macports, I recommend to either install the SDK parts manually. That's mainly Qt Creator and the framework libs itself, both are available as precompiled binaries on the download pages. Optionally one can go with building the framework libs manually, that's not a hard task. Macports brings in a big bunch of unnecessary stuff which you do not need to develop using Qt. XCode is a prerequisite for all three options (SDK, single binaries, macports).
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Calling something "urgent" is most likely to slow down answers (cf. to http://www.catb.org/~esr/faqs/smart-questions.html please).
Qt Creator automatically detects the toolchain for you. So it seems you do not have set up XCode properly. Please check this. Open a command line window (Terminal.app), type in "gcc -v" and look if that works. If not, your XCode setup is messed up.