installing qt 5

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https://bbs.archlinux.org – hello i have installed archlinux today and i installed qt from pacmanbut when i compile my project qtcreator doesnt find <QtWidgets> , <QJsonDocument> , qt5 headers etci  have installed qt5-base from pacman.i have previously used ubuntu and installed qt5 from ppa  and my project compiled fine in ubuntuso please how i can i fix this issue?source code https://github.com/sharan01/ils sharan https://bbs.archlinux.org/profile.php?id=70149 2013-04-10T14:44:43Z (HowTos)