anchor.diff:      platforms = lib.platforms.linux;
     };
   }
  -
  
positive.code:   };
  
    nativeBuildInputs = [ makeWrapper ];
    buildInputs = [ tcl tk libX11 zlib ];
  
    prePatch = ''
      sed -i -e '/^ *set headerPath *{/a ${tcl}/include ${tk}/include' \
  
negative.code: { lib, fetchurl, tcl, tk, libX11, zlib, makeWrapper, makeDesktopItem }:
  
  tcl.mkTclDerivation rec {
    pname = "scid-vs-pc";
    version = "4.21";
  
  