qmake not found although Qt installed

What distro is that? Probably qmake is in separate package, e.g. in Debian it's qt4-qmake package, also look for some qt-devel, qt4-devel or similar.

pwadas@vao:~$ which qmake/usr/bin/qmakepwadas@vao:~$ ls -al /usr/bin/qmakelrwxrwxrwx 1 root root 23 mar 26  2012 /usr/bin/qmake -> /etc/alternatives/qmakepwadas@vao:~$ update-alternatives --list qmake/usr/bin/qmake-qt3/usr/bin/qmake-qt4pwadas@vao:~$ dpkg -S /usr/bin/qmake-qt4qt4-qmake: /usr/bin/qmake-qt4pwadas@vao:~$ 

Seeing as the Qt3/Qt4 libraries overlap in all the Linux distros I've tried, I thought it might be a good idea to provide a more thorough answer to resolving this issue. If you're running a debian-based distro, the previously-suggested answer to use dpkg might work; however, on other Linux distributions, such as Fedora, for example, that won't quite work.

A more suitable solution, regardless of what distribution you're running, if you have alternatives installed is to do this:

update-alternatives --install /usr/bin/qmake qmake /usr/bin/qmake-qt4 10

Then, for good measure, you can follow that with: update-alternatives --set qmake /usr/bin/qmake-qt4