anchor.diff:      doxygen                   # (optional) api docs
       pythonPackages.sphinx     # (optional) documentation -> doc/INSTALL
       texinfo                   # (optional) documentation -> doc/INSTALL
  -  ] ++ optional withEmacs [ emacs ];
  +  ] ++ optional withEmacs emacs;
   
     buildInputs = [
       gnupg                     # undefined dependencies
  
positive.code:   meta = {
      description = "Mail indexer";
      homepage    = "https://notmuchmail.org/";
      license     = licenses.gpl3;
      maintainers = with maintainers; [ flokli puckipedia ];
      platforms   = platforms.unix;
    };
  
negative.code:     inherit version;
    };
  
    src = fetchurl {
      url = "https://notmuchmail.org/releases/notmuch-${version}.tar.xz";
      sha256 = "1myylb19hj5nb1vriqng252vfjwwkgbi3gxj93pi2q1fzyw7w2lf";
    };
  
    nativeBuildInputs = [
  