anchor.diff:  { nixpkgs ? { outPath = (import ./all-packages.nix {}).lib.cleanSource ../..; revCount = 1234; shortRev = "abcdef"; }
   , officialRelease ? false
   , # The platforms for which we build Nixpkgs.
  -  supportedSystems ? [ "x86_64-linux" "i686-linux" "x86_64-darwin" ]
  +  supportedSystems ? [ "x86_64-linux" "i686-linux" ]
   , scrubJobs ? true
   }:
   
  
positive.code:       xterm = linux;
        zdelta = linux;
        zsh = linux;
        zsnes = ["i686-linux"];
  
        #emacs24PackagesNg = packagePlatforms pkgs.emacs24PackagesNg;
  
        gnome = {
          gnome_panel = linux;
  
negative.code:         xf86videovesa = linux;
          xf86videovmware = linux;
          xf86videomodesetting = linux;
          xfs = linux;
          xinput = linux;
          xkbcomp = linux;
          xlsclients = linux;
          xmessage = linux;
          xorgserver = linux;
          xprop = linux;
          xrandr = linux;
          xrdb = linux;
          xset = linux;
          xsetroot = linux;
          xwininfo = linux;
        };
  
        xfce = {
  