This also fixes compilation error in kdenlive svn path=/nixpkgs/trunk/; revision=25857
svn path=/nixpkgs/trunk/; revision=24567
svn path=/nixpkgs/trunk/; revision=21459
Kdenlive looks for some binaries in PATH, so some dependencies may be fulfilled not by kdenlive nix expression. svn path=/nixpkgs/trunk/; revision=21458