anchor.diff:    executableHaskellDepends = (with haskellPackages; [
       base binary binary-orphans blaze-builder blaze-html bytestring
       cmdargs conduit containers monad-control deepseq directory fclabels file-embed
  -    filepath gitrev http-types HUnit lifted-base mtl parsec process
  +    filepath gitrev http-types HUnit lifted-base mtl monad-unlift parsec process
       resourcet safe shakespeare tamarin-prover-term
       template-haskell text threads time wai warp yesod-core yesod-static
     ]) ++ [ tamarin-prover-utils
  
positive.code:     wrapProgram $out/bin/tamarin-prover \
        --prefix PATH : ${lib.makeBinPath [ which maude graphviz sapic ]}
      # so that the package can be used as a vim plugin to install syntax coloration
      install -Dt $out/share/vim-plugins/tamarin-prover/syntax/ etc/{spthy,sapic}.vim 
      install etc/filetype.vim -D $out/share/vim-plugins/tamarin-prover/ftdetect/tamarin.vim
    '';
  
  
negative.code: }:
  
  let
    version = "1.4.0";
    src = fetchFromGitHub {
      owner  = "tamarin-prover";
      repo   = "tamarin-prover";
      rev    = "7ced07a69f8e93178f9a95797479277a736ae572";
      sha256 = "02pyw22h90228g6qybjpdvpcm9d5lh96f5qwmy2hv2bylz05z3nn";
    };
  
    # tamarin has its own dependencies, but they're kept inside the repo,
  