[Icecast] libshout error with pthread_mutex_init using Shout.pm

[Gypsy Rogers]

 Any idea what might cause this error to happen on a
FreeBSD 4.9 machine trying to use Shout.pm with perl 5.8.5
?

 /usr/libexec/ld-elf.so.1: /usr/local/lib/libshout.so.3:
Undefined symbol "pthread_mutex_init"