NLANR/DAST Multicast Beacon

The make process is failing for me. I have OS X 10.5.2. Any help would be appreciated:

[david-russells-macbook-pro:~/downloads/beacon-1.3] drussell% make
if gcc -DHAVE_CONFIG_H -I. -I. -I. -I./common/src -g -O2 -MT common/src/net_udp.o -MD -MP -MF "common/src/.deps/net_udp.Tpo" \
-c -o common/src/net_udp.o `test -f 'common/src/net_udp.c' || echo './'`common/src/net_udp.c; \
then mv -f "common/src/.deps/net_udp.Tpo" "common/src/.deps/net_udp.Po"; \
else rm -f "common/src/.deps/net_udp.Tpo"; exit 1; \
fi
In file included from common/src/net_udp.c:47:
common/src/inet_ntop.h:6: error: conflicting types for ‘inet_ntop’
/usr/include/arpa/inet.h:99: error: previous declaration of ‘inet_ntop’ was here
make: *** [common/src/net_udp.o] Error 1