anchor.diff: -{ stdenv, lib, fetchurl, buildDunePackage, ocaml, dune-configurator
  -, pkg-config, cairo
  -}:
  +{ stdenv, lib, fetchurl, buildDunePackage, ocaml, dune-configurator, pkg-config, cairo }:
   
   buildDunePackage rec {
     pname = "cairo2";
  -  version = "0.6.1";
  -
  -  useDune2 = true;
  +  version = "0.6.2";
   
     src = fetchurl {
       url = "https://github.com/Chris00/ocaml-cairo/releases/download/${version}/cairo2-${version}.tbz";
  -    sha256 = "1ik4qf4b9443sliq2z7x9acd40rmzvyzjh3bh98wvjklxbb84a9i";
  +    sha256 = "sha256-a7P1kiVmIwT6Fhtwxs29ffgO4iexsulxUoc9cnJmEK4=";
     };
  +
  +  minimalOCamlVersion = "4.02";
  +  useDune2 = true;
   
     nativeBuildInputs = [ pkg-config ];
     buildInputs = [ cairo dune-configurator ];
  
positive.code:   # https://github.com/Chris00/ocaml-cairo/issues/19
    || lib.versionAtLeast ocaml.version "4.10");
  
    meta = {
      homepage = "https://github.com/Chris00/ocaml-cairo";
      description = "Binding to Cairo, a 2D Vector Graphics Library";
      longDescription = ''
  
negative.code:       the X Window System, Quartz, Win32, image buffers, PostScript, PDF,
        and SVG file output.
      '';
      license = licenses.lgpl3;
      maintainers = with maintainers; [ jirkamarsik vbgl ];
    };
  }
  