{stdenv, fetchurl}:

stdenv.mkDerivation {
  name = "tcl-8.4.18";

  src = fetchurl {
    url = mirror://sourceforge/tcl/tcl8.4.18-src.tar.gz;
    sha256 = "197h3m2lc5a6famc683zhjp55774gf8zwggfy2893v48lp5p7qny";
  };

  preConfigure = "cd unix";

  postInstall = ''
    make install-private-headers
    ln -s $out/bin/tclsh8.4 $out/bin/tclsh
  '';
  
  meta = {
    description = "The Tcl scription language";
    homepage = http://www.tcl.tk/;
  };
}