Phonon backends linking phase fails

[Andrea Scarpino]

Hi all,
after the update to Phonon 4.6.0, both gstreamer (4.5.1) and vlc (0.4.1) 
backends doesn't build anymore. More precisely the linking phase fails[1][2].

I'm on Arch Linux, x86_64, but I don't think is an archlinux-related issue 
because if I try to build from git, both gstreamer and vlc, everything's fine 
and backends work. Any help is appreciated.

Thanks

[1] http://paste.kde.org/176780/
[2] http://paste.kde.org/177014/

-- 
Andrea