anchor.diff: -{ lib, fetchFromGitHub, buildDunePackage
  +{ lib, fetchurl, buildDunePackage
   , alcotest, git, mtime, nocrypto
   , angstrom, astring, cstruct, decompress, digestif, encore, duff, fmt
   , fpath, hex, ke, logs, lru, ocaml_lwt, ocamlgraph, ocplib-endian, uri, rresult
  
positive.code: 		description = "Git format and protocol in pure OCaml";
  		license = lib.licenses.isc;
  		maintainers = [ lib.maintainers.vbgl ];
  		inherit (src.meta) homepage;
  	};
  }
  
negative.code: 
  buildDunePackage rec {
    pname = "git";
  	version = "2.1.2";
  
  	src = fetchurl {
  		url = "https://github.com/mirage/ocaml-git/releases/download/${version}/git-${version}.tbz";
  		sha256 = "0yyclsh255k7pvc2fcsdi8k2fcrr0by2nz6g3sqnwlimjyp7mz5j";
  	};
  
  	propagatedBuildInputs = [ angstrom astring cstruct decompress digestif encore duff fmt fpath hex ke logs lru ocaml_lwt ocamlgraph ocplib-endian uri rresult ];
  