shell:

localhost log # for i in /usr/lib/asterisk/modules/*so; do ldd $i| grep cap; done
localhost log # ldd /usr/sbin/asterisk
linux-gate.so.1 => (0xffffe000)
libdl.so.2 => /lib/libdl.so.2 (0xb7fa1000)
libpthread.so.0 => /lib/libpthread.so.0 (0xb7f8a000)
libncurses.so.5 => /lib/libncurses.so.5 (0xb7f48000)
libm.so.6 => /lib/libm.so.6 (0xb7f22000)
libresolv.so.2 => /lib/libresolv.so.2 (0xb7f0f000)
libc.so.6 => /lib/libc.so.6 (0xb7dd9000)
/lib/ld-linux.so.2 (0xb7fac000)
localhost log # equery list pcap
[ Searching for package 'pcap' in all categories among: ]
* installed packages
[I--] [ ~] net-libs/libpcap-0.9.8-r1 (0)