let
  pkgs = import <nixpkgs> {}; in
    import pkgs.path { overlays = [ (self: super: {
      ocamlPackages = super.ocamlPackages // {
        js_of_ocaml = super.ocamlPackages.js_of_ocaml.overrideDerivation (old: {
          patches = [ ./explicitly-call-bash-in-jbuild.patch ] ;
        } ) ;
      } ;
      myProject = pkgs.stdenv.mkDerivation {
        name = "myProject";
        version = "1";
        src = if pkgs.lib.inNixShell then null else null; #nix;

        buildInputs = with pkgs.ocamlPackages; [
          ocsigen-start
        ];
      };
    } ) ] ; }