anchor.diff:  , bzip2
   , db
   , gdbm
  +, less
   , libX11, xproto
   , lzma
   , ncurses
  
positive.code:   inherit majorVersion version;
  
    inherit buildInputs;
  
    src = fetchurl {
      url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
  
negative.code:   buildInputs = filter (p: p != null) [
      zlib bzip2 lzma gdbm sqlite db readline ncurses openssl tcl tk libX11 xproto
    ];
  
    propagatedBuildInputs = [
      less
    ];
  
  in
  stdenv.mkDerivation {
    name = "python3-${version}";
  