anchor.diff:    bind = linux;
     bison23 = all;
     bison24 = all;
  -  bitlbee = linux; 
  +  bitlbee = linux;
     bittorrent = linux;
     blender = linux;
     boost = all;
  
positive.code:   pythonPackages = {
      zfec = linux;
    };
    
    xorg = {
      fontadobe100dpi = linux;
      fontadobe75dpi = linux;
  
negative.code:     /nix/var/nix/gcroots/per-user/hydra/hydra-roots --argstr \
      system i686-linux --argstr system x86_64-linux --arg \
      nixpkgs "{outPath = ./}" .... release.nix
  
    Hydra can be installed with "nix-env -i hydra".
  */
  with (import ./release-lib.nix);
  