* Package:    net-analyzer/gspoof-3.2-r2
 * Repository: gentoo
 * USE:        abi_x86_64 amd64 elibc_glibc kernel_linux userland_GNU
 * FEATURES:   network-sandbox preserve-libs sandbox splitdebug userpriv usersandbox
>>> Unpacking source...
>>> Unpacking gspoof-3.2.tar.gz to /var/tmp/portage/net-analyzer/gspoof-3.2-r2/work
>>> Source unpacked in /var/tmp/portage/net-analyzer/gspoof-3.2-r2/work
>>> Preparing source in /var/tmp/portage/net-analyzer/gspoof-3.2-r2/work/gspoof-3.2 ...
 * Applying gspoof-def-values.patch ...
 [ ok ]
 * Applying gspoof-3.2-icon.patch ...
 [ ok ]
 * Running eautoreconf in '/var/tmp/portage/net-analyzer/gspoof-3.2-r2/work/gspoof-3.2' ...
 * Running autoconf --force ...
 [ ok ]
 * Running autoheader ...
 [ ok ]
 * Running elibtoolize in: gspoof-3.2/
>>> Source prepared.
>>> Configuring source in /var/tmp/portage/net-analyzer/gspoof-3.2-r2/work/gspoof-3.2 ...
./configure --prefix=/usr --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --mandir=/usr/share/man --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc --localstatedir=/var/lib --libdir=/usr/lib64

Please wait, i'm going to configure Gspoof (have you read README?)

checking for x86_64-pc-linux-gnu-gcc... x86_64-pc-linux-gnu-gcc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... no
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether x86_64-pc-linux-gnu-gcc accepts -g... yes
checking for x86_64-pc-linux-gnu-gcc option to accept ISO C89... none needed
checking whether make sets $(MAKE)... yes
checking how to run the C preprocessor... x86_64-pc-linux-gnu-gcc -E
checking for grep that handles long lines and -e... /bin/grep
checking for egrep... /bin/grep -E
checking whether x86_64-pc-linux-gnu-gcc needs -traditional... no
checking for /usr/lib/libnet.so... no
configure: error: 
Libnet-1.1.1 Packet Shaping Library is required!
Verify to have installed it and pass --with-libnet-prefix to configure.
Or download it from http://www.packetfactory.net/libnet 

!!! Please attach the following file when seeking support:
!!! /var/tmp/portage/net-analyzer/gspoof-3.2-r2/work/gspoof-3.2/config.log
 * ERROR: net-analyzer/gspoof-3.2-r2::gentoo failed (configure phase):
 *   econf failed
 * 
 * Call stack:
 *               ebuild.sh, line  124:  Called src_configure
 *             environment, line 2247:  Called default
 *      phase-functions.sh, line  868:  Called default_src_configure
 *      phase-functions.sh, line  903:  Called __eapi2_src_configure
 *        phase-helpers.sh, line  835:  Called econf
 *        phase-helpers.sh, line  718:  Called __helpers_die 'econf failed'
 *   isolated-functions.sh, line  119:  Called die
 * The specific snippet of code:
 *   		die "$@"
 * 
 * If you need support, post the output of `emerge --info '=net-analyzer/gspoof-3.2-r2::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=net-analyzer/gspoof-3.2-r2::gentoo'`.
 * The complete build log is located at '/var/log/portage/net-analyzer:gspoof-3.2-r2:20190224-224759.log'.
 * For convenience, a symlink to the build log is located at '/var/tmp/portage/net-analyzer/gspoof-3.2-r2/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/net-analyzer/gspoof-3.2-r2/temp/environment'.
 * Working directory: '/var/tmp/portage/net-analyzer/gspoof-3.2-r2/work/gspoof-3.2'
 * S: '/var/tmp/portage/net-analyzer/gspoof-3.2-r2/work/gspoof-3.2'