anchor.diff:    osx-exe        = tttool-exe pkgs-osx
        "0rnn4q0gx670nzb5zp7xpj7kmgqjmxcj2zjl9jqqz8czzlbgzmkh";
     osx-exe-bundle = osx-bundler pkgs-osx osx-exe;
  -
  -  macdylibbundler = pkgs.macdylibbundler;
   
     static-files = sourceByRegex ./. [
       "README.md"
  
positive.code:     buildPhase = ''
        mkdir .cabal
        touch .cabal/config
        rm cabal.project # so that cabal new-freeze does try to use HPDF via git
        HOME=$PWD cabal new-freeze --offline --enable-tests || true
      '';
      installPhase = ''
  
negative.code: { checkMaterialization ? false }:
  let
    sources = import nix/sources.nix;
  
    # patch haskell.nix to work around
    # https://github.com/input-output-hk/haskell.nix/issues/917
  