Build-Depends needs to be on in the first part of the file (the "source" bit, rather than the "package" bit).
Source: countdowntimer Section: user/other Priority: extra Maintainer: Sascha Makela <sascha.makela@gmail.com> Build-Depends: debhelper (>= 5), libqt4-phonon Standards-Version: 3.7.3 Homepage: <insert the upstream URL, if relevant> Package: countdowntimer Architecture: any Depends: ${shlibs:Depends}, ${misc:Depends} Description: A simple countdown timer <insert long description, indented with spaces>