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