See #490 discussion. This reverts commit 1278859d3167b9f84bfab680d9c8c463adf64a60, reversing changes made to 0c020c98f9d4f49d5c9907db5f4b35aac7df959b. Conflicts: pkgs/desktops/xfce/core/xfce4-session.nix (take master) pkgs/lib/misc.nix (auto)
now the default (and usually only) version is called default
also needed for the updated cairo
http://hydra.nixos.org/build/3150785