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/opt/qt/bin/qmake -query QT_VERSION returns unknown. I wanted to install QtJambi, but the build fails because of this. How to fix it?
Are you using Qt 3? It does not support QT_VERSION and you should seriously consider upgrading to a recent Qt version.
No, I've installed 4.7.4
What does qmake -v and qmake -query say?
I installed 4.7.4 but qmake -v says Qt 3.3.8 When I do pacman -S qt it shows me "qt-4.7.4 is up to date!"
Remove your Qt 3 installation and/or fix your environment so that Qt 4 is used (QTDIR, PATH).