extract both bz2 and gz files from distfiles

[Boris Samorodov]

Hi!


We have got a port (lang/gnat-gcc34) which has both bz2 and gz
distfiles. As for 5.x+ extracting is gone automagically. But not at
4.x. Well, at 4.x extracting may be done for example, by using
USE_BZIP2 knob and doing gunzipping at after-extract:.

Does someone know a better solution?
Does we have examples at our ports?

Thanks.


WBR
-- 
Boris Samorodov (bsam)
Research Engineer, http://www.ipt.ru Telephone & Internet SP
FreeBSD committer, http://www.FreeBSD.org The Power To Serve