anchor.diff:  
   stdenv.mkDerivation rec {
     pname = "tcsh";
  -  version = "6.22.03";
  +  version = "6.22.04";
   
     src = fetchurl {
       urls = [
  
positive.code:       "ftp://ftp.funet.fi/pub/unix/shells/tcsh/${pname}-${version}.tar.gz"
        "ftp://ftp.funet.fi/pub/unix/shells/tcsh/old/${pname}-${version}.tar.gz"
      ];
      sha256 = "sha256-viz9ZT0qDH9QbS3RTBIyS6dJvUhAN75t9Eo5c/UiYrc=";
    };
  
    buildInputs = [ ncurses ];
  
negative.code:     });
  
    meta = with lib; {
      homepage = "https://www.tcsh.org/";
      description = "An enhanced version of the Berkeley UNIX C shell (csh)";
      longDescription = ''
        tcsh is an enhanced but completely compatible version of the Berkeley UNIX
        C shell, csh. It is a command language interpreter usable both as an
        interactive login shell and a shell script command processor.
  
        It includes:
        - command-line editor
        - programmable word completion
  