Creating and building project against "dev" branch fails

Creating a new project and using my "dev" kit (current dev branch of Qt), I get the error message:

11:55:12: Running steps for project untitled...
11:55:12: Could not start process "/home/andreasbuhr/development/qtdev/qtbase/cmake-build-debug/bin/qmake" /home/andreasbuhr/foo/untitled/untitled.pro -spec linux-g++ CONFIG+=qml_debug
Error while building/deploying project untitled (kit: dev)
When executing step "qmake"
11:55:12: Elapsed time: 00:00.

See screenshot:

Running the same command in the terminal works fine: