2012/4/8 Udo Richter <udo_richter@gmx.de>

- If CACHEDIR or RESDIR is not set (empty string), fall back to whatever
--video and --config is set to.

No, CACHEDIR and RESDIR should work in the same behaviour as CONFDIR or VIDEODIR.

This sounds a bit like you set all your directories by command line. Sorry, but why don't you just use Make.config like everyone else does.