emacsPackages.elfeed: patch in curl program path

        # missing optional dependencies

        ekg = addPackageRequires super.ekg [ self.denote ];

        elfeed = super.elfeed.overrideAttrs (attrs: {

          postPatch = attrs.postPatch or "" + ''

            substituteInPlace elfeed-curl.el \

              --replace-fail 'elfeed-curl-program-name "curl"' 'elfeed-curl-program-name "${lib.getExe pkgs.curl}"'

          '';

        });

        elisp-sandbox = ignoreCompilationError super.elisp-sandbox; # elisp error

        elnode = ignoreCompilationError super.elnode; # elisp error