anchor.diff:    "4.07" = {
       version = "5.1+4.06.0";
       sha256 = "1ww4cspdpgjjsgiv71s0im5yjkr3544x96wsq1vpdacq7dr7zwiw"; };
  -  "4.08" = v6_5;
  -  "4.09" = v6_5;
  -  "4.10" = v6_5;
  -  "4.11" = v6_5;
  -  "4.12" = v6_5;
  -  "4.13" = v6_5;
  -  "4.14" = v6_5;
  +  "4.08" = v6_6;
  +  "4.09" = v6_6;
  +  "4.10" = v6_6;
  +  "4.11" = v6_6;
  +  "4.12" = v6_6;
  +  "4.13" = v6_6;
  +  "4.14" = v6_6;
   }.${ocaml.meta.branch};
   in
   
  
positive.code: { lib, stdenv, fetchFromGitHub, buildDunePackage, ocaml, findlib, cppo }:
  
  let param =
    let v6_5 = {
      version = "6.5";
      sha256 = "sha256:0fwibah2hgllrnbdrmfqil5gr5raf6pb5h2zx6zs1h3d4ykvy8k8";
      useDune2 = true;
      nativeBuildInputs = [cppo];
      buildInputs = [cppo];
    }; in
  
negative.code: then
    buildDunePackage {
      inherit pname src meta;
      inherit (param) version buildInputs nativeBuildInputs;
  
      strictDeps = true;
    }
  