anchor.diff:      enableParallelBuilding = true;
   
       meta = with stdenv.lib; {
  -      homepage = "http://pypy.org/";
  +      homepage = http://pypy.org/;
         description = "Fast, compliant alternative implementation of the Python language (2.7.3)";
         license = licenses.mit;
         platforms = platforms.linux;
  
positive.code:        # verify cffi modules
         $out/bin/pypy -c "import Tkinter;import sqlite3"
  
         # TODO: compile python files?
      '';
  
      passthru = {
  
negative.code:       sha256 = "0fg4l48c7n59n5j3b1dgcsr927xzylkfny4a6pnk6z0pq2bhvl9z";
      };
  
      buildInputs = [ bzip2 openssl pkgconfig pythonFull libffi ncurses expat sqlite tk tcl x11 libX11 makeWrapper ]
        ++ stdenv.lib.optional (stdenv ? gcc && stdenv.gcc.libc != null) stdenv.gcc.libc
        ++ stdenv.lib.optional zlibSupport zlib;
  
  