* USE:  3dnow 3dnowext X alsa amd64 amr bzip2 dirac elibc_glibc encode hardcoded-tables ieee1394 jpeg2k kernel_linux mmx mmxext mp3 multilib oss pic sdl ssse3 theora threads userland_GNU v4l v4l2 vaapi vorbis vpx x264 zlib
>>> Unpacking source...
>>> Unpacking ffmpeg-0.6_p25423.tar.bz2 to /var/tmp/portage/media-video/ffmpeg-0.6_p25423/work
>>> Source unpacked in /var/tmp/portage/media-video/ffmpeg-0.6_p25423/work
>>> Preparing source in /var/tmp/portage/media-video/ffmpeg-0.6_p25423/work/ffmpeg-0.6_p25423 ...
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/media-video/ffmpeg-0.6_p25423/work/ffmpeg-0.6_p25423 ...
Unable to create and execute files in /var/tmp/portage/media-video/ffmpeg-0.6_p25423/temp.  Set the TMPDIR environment
variable to another directory and make sure that it is not mounted noexec.
Sanity test failed.

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.
 * ERROR: media-video/ffmpeg-0.6_p25423 failed:
 *   (no error message)
 *
 * Call stack: