Libnet fails to build on OSX 10.5.1

[kung.foo@…]

System:

Model Name: MacBook Model Identifier: MacBook3,1 Processor Name: Intel Core 2 Duo

---> Building libnet with target all Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_net_libnet/work/Libnet-1.0.2a" && make all " returned error 2 Command output: /usr/bin/gcc-4.0 -O2 -funroll-loops -fomit-frame-pointer -Wall -I/opt/local/include -DHAVE_CONFIG_H -c src/libnet_insert_ipo.c -o src/libnet_insert_ipo.o In file included from src/../include/libnet.h:81,

from src/libnet_insert_ipo.c:36:

src/../include/./libnet/libnet-functions.h:500: warning: 'struct ipoption' declared inside parameter list src/../include/./libnet/libnet-functions.h:500: warning: its scope is only this definition or declaration, which is probably not what you want src/libnet_insert_ipo.c:39: warning: 'struct ipoption' declared inside parameter list src/libnet_insert_ipo.c:40: error: conflicting types for 'libnet_insert_ipo' src/../include/./libnet/libnet-functions.h:500: error: previous declaration of 'libnet_insert_ipo' was here src/libnet_insert_ipo.c: In function 'libnet_insert_ipo': src/libnet_insert_ipo.c:83: error: dereferencing pointer to incomplete type make: * [src/libnet_insert_ipo.o] Error 1

Error: The following dependencies failed to build: libnet libnids Error: Status 1 encountered during processing.