anchor.diff:      done;
       '';
     configureFlags = [
  -    "--with-tclinclude=${tcl}/include"
       "--with-tclconfig=."
       "--with-tkinclude=${tk.dev}/include"
       "--with-tkconfig=."
  
positive.code:     sha256 = "1jaz0l22xj7x1k4rb9ia6i1psnbwk4pblgq4gfvya7gg7fbb7r36";
      })
    ;
    buildInputs = [ tcl tk ];
    # the configure script expects to find the location of the sources of
    # tcl and tk in {tcl,tk}Config.sh
    # In fact, it only needs some private headers. We copy them in
  
negative.code: { lib, stdenv, fetchurl, tcl, tk, fetchpatch } :
  
  tcl.mkTclDerivation {
    version = "8.4.3";
    pname = "tix";
    src = fetchurl {
  