ffmpeg Problem

[Marjo Van Lier]

I have the following problem.

BSD# uname -a
FreeBSD XXX 6.2-RELEASE FreeBSD 6.2-RELEASE #2: Tue Aug 21 11:47:36 SAST
2007     root at BSD.local:/usr/obj/usr/src/sys/MARJO  i386

BSD# php -r 'phpinfo();' | grep ffmpeg
PHP Warning:  PHP Startup: Unable to load dynamic library
'/usr/local/lib/php/20060613/ffmpeg.so' - /usr/local/lib/libavcodec.so.1:
Undefined symbol "pthread_join" in Unknown on line 0

What could be the problem?