anchor.diff:  { stdenv, fetchurl, zlib ? null, zlibSupport ? true, bzip2, pkgconfig, libffi
  -, sqlite, openssl, ncurses, pythonFull, expat, tcl, tk, x11, libX11 }:
  +, sqlite, openssl, ncurses, pythonFull, expat, tcl, tk, x11, libX11
  +, makeWrapper }:
   
   assert zlibSupport -> zlib != null;
   
  
positive.code:       sha256 = "0fg4l48c7n59n5j3b1dgcsr927xzylkfny4a6pnk6z0pq2bhvl9z";
      };
  
      buildInputs = [ bzip2 openssl pkgconfig pythonFull libffi ncurses expat sqlite tk tcl x11 libX11 ]
        ++ stdenv.lib.optional (stdenv ? gcc && stdenv.gcc.libc != null) stdenv.gcc.libc
        ++ stdenv.lib.optional zlibSupport zlib;
  
  
negative.code:        # verify cffi modules
         $out/bin/pypy -c "import Tkinter;import sqlite3"
  
         # make sure pypy finds sqlite3 library
         wrapProgram "$out/bin/pypy" \
           --set LD_LIBRARY_PATH "${LD_LIBRARY_PATH}" \
           --set LIBRARY_PATH "${LIBRARY_PATH}"
      '';
  
      passthru = {
  