anchor.diff:    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}";
  
positive.code: , bzip2
  , db
  , gdbm
  , libX11, xproto
  , lzma
  , ncurses
  
negative.code:   inherit majorVersion version;
  
    inherit buildInputs;
    inherit propagatedBuildInputs;
  
    src = fetchurl {
      url = "http://www.python.org/ftp/python/${version}/Python-${version}.tar.xz";
  