Defined in /home/build/jenkins/workspace/RockBootstrap19/FLAVOR/next/label/DebianUnstable/dev/autoproj/remotes/rock/rock.osdeps as

qt4:
    debian,ubuntu:
      - libqt4-dev
      - qt4-qmake
      gentoo:
      - qt-core
      - qt-gui
      fedora: qt-devel