anchor.diff:      ln -s $out/${executable}/include $out/include/${libPrefix}
       ln -s $out/${executable}-c/lib-python/${if isPy3k then "3" else pythonVersion} $out/lib/${libPrefix}
   
  -    # We must wrap the original, not the symlink.
  -    # PyPy uses argv[0] to find its standard library, and while it knows
  -    # how to follow symlinks, it doesn't know about wrappers. So, it
  -    # will think the wrapper is the original. As long as the wrapper has
  -    # the same path as the original, this is OK.
  -    wrapProgram "$out/${executable}-c/${executable}-c" \
  -      --set LD_LIBRARY_PATH "${LD_LIBRARY_PATH}:$out/lib" \
  -      --set LIBRARY_PATH "${LIBRARY_PATH}:$out/lib"
  -
       # verify cffi modules
       $out/bin/${executable} -c ${if isPy3k then "'import tkinter;import sqlite3;import curses;import lzma'" else "'import Tkinter;import sqlite3;import curses'"}
   
  
positive.code:     inherit sha256;
    };
  
    nativeBuildInputs = [ pkgconfig makeWrapper ];
    buildInputs = [
      bzip2 openssl pythonForPypy libffi ncurses expat sqlite tk tcl xlibsWrapper libX11 gdbm db
    ]  ++ optionals isPy3k [
  
negative.code: { stdenv, substituteAll, fetchurl
  , zlib ? null, zlibSupport ? true, bzip2, pkgconfig, libffi
  , sqlite, openssl, ncurses, python, expat, tcl, tk, tix, xlibsWrapper, libX11
  , callPackage, self, gdbm, db, lzma
  , python-setup-hook
  # For the Python package set
  , packageOverrides ? (self: super: {})
  