thresh@in trunk $ ./configure   
mktemp: illegal option -- u
mktemp: illegal option -- u
mktemp: illegal option -- u
mktemp: illegal option -- u
mktemp: illegal option -- u
mktemp: illegal option -- u
mktemp: illegal option -- u
Unknown OS 'hp-ux'.

If you think configure made a mistake, make sure you are using the latest
version from SVN.  If the latest version fails, report the problem to the
ffmpeg-user@mplayerhq.hu mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solving the problem.