checking for sys/socket.h... yes
checking for netdb.h... yes
checking for arpa/inet.h... yes
checking for string.h... yes
checking for signal.h... yes
checking for pcap.h... yes
checking for ctype.h... yes
checking for netinet/in_systm.h... yes
checking for sys/types.h... (cached) yes
checking for sys/time.h... yes
checking for unistd.h... yes
checking for getopt.h... yes
checking whether byte ordering is bigendian... no
checking for -lsocket... no
checking for -lnsl... yes
checking for bzero... yes
checking for inet_ntoa... yes
checking for pcap_next in -lpcap... yes
checking for libnet_build_ip in -lnet... no
configure: error: Install libnet
root@SoekrisFirewall:~/filterrules# dpkg -l | grep libnet
ii  libnet-dns-perl              0.53-2ubuntu1.1              Perform DNS queries from a Perl script
ii  libnet-ip-perl               1.24-1                       Perl extension for manipulating IPv4/IPv6 ad
ii  libnet1                      1.1.2.1-2                    library for the construction and handling of
ii  libnet1-dev                  1.1.2.1-2                    development files for libnet
ii  libnetpbm10                  10.0-10ubuntu1               Shared libraries for netpbm
ii  libnetpbm10-dev              10.0-10ubuntu1               Development libraries and header files