After updating qt5base-dev using debian experimental, and adding -fPIC to the CXXFLAGS, it compiled nicely :)
edit: there seems to be a slight problem with text rendering tho(only lowercase 'a' and bullet points are drawn), see http://imgur.com/MiX1hvL More of a qt5 issue I think
Fixed it invoking as "antimony -style gtk"
According to https://wiki.archlinux.org/index.php/Uniform_Look_for_Qt_and... qt5 attempts to be smart with guessing the desktop environment under wich it is running.
You probably already knew that, but I think it means the cure is probably to install Qt 5.4 (or the prerelease 5.5) from source.
Do you see other compile problems if you run make -k, or just that one?