anchor.diff:    fetchNixpkgs = import ./fetchNixpkgs.nix;
   
     nixpkgs = fetchNixpkgs {
  -     rev = "6db7f92cc2af827e8b8b181bf5ed828a1d0f141d";
  -     sha256 = "1wpnln6spcvqvrfqw49z83ky5v8gw951f818q5123l0qpywpmfsq";
  +     rev = "be5e8faafc69195ef47e9cf6b92806cf427656e1";
  +     sha256 = "0rvz7ac8bl2x9yrxrkzmgl3mwy4sjm0ngk44zfcfg81czgam7d6r";
     };
   
     pkgs = import nixpkgs { config = {}; };
  
positive.code:     w3m
      wget
      ] ++ (if stdenv.isDarwin then [] else [
          calibre
          crawl
          darcs
  
negative.code:     atool
      autojump
      bazaar
      curl
      cvs
      editorconfig-core-c
      git
      git-lfs
      gitAndTools.hub
      gnupg
      gphoto2
      graphviz
      haskellPackages.pandoc
      haskellPackages.sizes
      htop
  