anchor.diff:  
     cargoSha256 = "0kcc0b2644qbalz7dnqwxsjdmw1h57k0rjrvwqh8apj2sgl64gyv";
   
  -  buildInputs = stdenv.lib.optionals stdenv.isDarwin [ CoreServices ];
  +  buildInputs = stdenv.lib.optionals stdenv.isDarwin [
  +    CoreServices
  +    # This is needed to avoid an undefined symbol error for "_CFURLResourceIsReachable"
  +    darwin.cf-private
  +  ];
   
     meta = with stdenv.lib; {
       description = "Create books from MarkDown";
  
positive.code:     license = [ licenses.asl20 licenses.mit ];
      maintainers = [ maintainers.havvy ];
      platforms = platforms.all;
  
      # Because CoreServices needs to be updated,
      # but Apple won't release the source.
      broken = stdenv.isDarwin;
    };
  }
  
negative.code: { stdenv, fetchFromGitHub, rustPlatform, CoreServices, darwin }:
  
  rustPlatform.buildRustPackage rec {
    name = "mdbook-${version}";
  