anchor.diff:  #
   #  freefall = callPackage ../os-specific/linux/freefall { };
   #
  -#  fuse = callPackage ../os-specific/linux/fuse { };
  +  fuse = callPackage ../os-specific/linux/fuse { };
   #
   #  fusionio-util = callPackage ../os-specific/linux/fusionio/util.nix { };
   #
  
positive.code: #
  #  philter = callPackage ../tools/networking/philter { };
  #
  #  pinentry = callPackage ../tools/security/pinentry {
  #    qt4 = null;
  #  };
  #
  #  pinentry_ncurses = pinentry.override {
  #    gtk2 = null;
  
negative.code: #  protobufc1_1 = callPackage ../development/libraries/protobufc/1.1.nix { };
  #  protobufc1_0 = callPackage ../development/libraries/protobufc/1.0.nix { };
  #
    pth = callPackage ../development/libraries/pth { };
  #
  #  ptlib = callPackage ../development/libraries/ptlib {};
  #
  