anchor.diff:      for cmd in $out/bin/*
       do
         wrapProgram "$cmd" \
  -        --set TCLLIBPATH "${tcl}/${tcl.libdir}" \
           --set TK_LIBRARY "${tk}/lib/${tk.libPrefix}"
       done
     '';
   
     meta = {
       description = "Chess database with play and training functionality";
  +    maintainers = with maintainers; [ agbrooks ];
       homepage = "http://scid.sourceforge.net/";
       license = lib.licenses.gpl2;
     };
  
positive.code: { lib, stdenv, fetchurl, tcl, tk, libX11, zlib, makeWrapper }:
  
  stdenv.mkDerivation {
    pname = "scid";
    version = "4.3";
  
  
negative.code:   };
  
    nativeBuildInputs = [ makeWrapper ];
    buildInputs = [ tk libX11 zlib ];
  
    prePatch = ''
      sed -i -e '/^ *set headerPath *{/a ${tcl}/include ${tk}/include' \
  