anchor.diff:      description = "Fast, portable and opinionated build system";
       maintainers = [ stdenv.lib.maintainers.vbgl ];
       license = stdenv.lib.licenses.asl20;
  -    inherit (ocaml.meta) platforms;
  +    inherit (ocamlPackages.ocaml.meta) platforms;
     };
   }
  
positive.code:     sha256 = "0571lzm8caq6wnia7imgy4a27x5l2bvxiflg0jrwwml0ylnii65f";
    };
  
    buildInputs = [ ocaml ];
  
    dontAddPrefix = true;
  
    installPhase = "${opam}/bin/opam-installer -i --prefix=$out --libdir=$OCAMLFIND_DESTDIR";
  
    preFixup = "rm -rf $out/jbuilder";
  
  
negative.code: { stdenv, fetchFromGitHub, ocamlPackages, opaline }:
  
  stdenv.mkDerivation rec {
    name = "jbuilder-${version}";
  