>>> Unpacking source...
>>> Unpacking tcptraceroute-1.5beta7.tar.gz to /var/tmp/portage/net-analyzer/tcptraceroute-1.5_beta7/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/net-analyzer/tcptraceroute-1.5_beta7/work/tcptraceroute-1.5beta7 ...
 * econf: updating tcptraceroute-1.5beta7/config.guess with /usr/share/gnuconfig/config.guess
 * econf: updating tcptraceroute-1.5beta7/config.sub with /usr/share/gnuconfig/config.sub
./configure --prefix=/usr --host=i686-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --build=i686-pc-linux-gnu
checking build system type... i686-pc-linux-gnu
checking host system type... i686-pc-linux-gnu
checking target system type... i686-pc-linux-gnu
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking whether make sets $(MAKE)... yes
checking for working aclocal-1.4... missing
checking for working autoconf... found
checking for working automake-1.4... missing
checking for working autoheader... found
checking for working makeinfo... found
checking for i686-pc-linux-gnu-gcc... i686-pc-linux-gnu-gcc
checking for C compiler default output file name... a.out
checking whether the C compiler works... yes
checking whether we are cross compiling... no
checking for suffix of executables... 
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether i686-pc-linux-gnu-gcc accepts -g... yes
checking for i686-pc-linux-gnu-gcc option to accept ANSI C... none needed
checking how to run the C preprocessor... i686-pc-linux-gnu-gcc -E
checking for egrep... grep -E
checking whether i686-pc-linux-gnu-gcc needs -traditional... no
checking for a BSD-compatible install... /usr/bin/install -c
checking for gethostbyname... yes
checking for socket... yes
checking for connect... yes
checking for inet_aton... yes
checking for pcap_open_live in -lpcap... yes
checking for main in -lnet... no
configure: error: cannot find libnet

!!! Please attach the following file when filing a report to bugs.gentoo.org:
!!! /var/tmp/portage/net-analyzer/tcptraceroute-1.5_beta7/work/tcptraceroute-1.5beta7/config.log
 * 
 * ERROR: net-analyzer/tcptraceroute-1.5_beta7 failed.
 * Call stack:
 *   ebuild.sh, line 1654:   Called dyn_compile
 *   ebuild.sh, line 990:   Called qa_call 'src_compile'
 *   ebuild.sh, line 44:   Called src_compile
 *   tcptraceroute-1.5_beta7.ebuild, line 26:   Called econf
 *   ebuild.sh, line 591:   Called die
 * 
 * econf failed
 * If you need support, post the topmost build error, and the call stack if relevant.
 * A complete build log is located at '/var/tmp/portage/net-analyzer/tcptraceroute-1.5_beta7/temp/build.log'.
 *