Libraries

Many libraries are needed:

libpcap - ftp://ftp.ee.lbl.gov/
capture and filter packets on the network

libnet - http://www.packetfactory.net/libnet/
generate packets on the network

libnids - http://www.packetfactory.net/libnids/
reassemble packets and sessions

libdb - http://www.sleepycat.com/ (for non-BSD/Linux systems)
saves unique authentications in a database

which permits to limit abuses :)

but a RPM package is available :(