We need this to treeclean the lib in bug 587972
Unfortunately this is not an optional dep so will require some upstream patching.
Turns out the dependency was dropped upstream already, fixed in git commit 1de2a4f7d218dede710d276c6d51f04f7c7985b5. See also: https://github.com/tomahawk-player/tomahawk/commit/ed9a02764431d9e2bb29c479db23396a647ed842