Bittorrent uses the 2.6 series of wxGTK, but when wxGTK-2.8 is installed, built_with_use checks the 2.8 series for the 'unicode' keyword, which no longer exists (all wxGTK-2.8 builds are unicode.) This causes emerge to die.
Created attachment 138916 [details] Updated bittorrent ebuild that checks correct wx{GTK,python} slots This updated ebuild uses the wxwidgets eclass and the need-wxwidgets function to ensure the correct version of wxGTK has been installed, and restricts built_with_use to check only the 2.6.x version of wxpython, in case 2.8.x is installed in parallel.
Fixed, thanks!