I tryed to install Libnet on Linux Fedora Core 2 but this is the output of ./configure: [root@localhost libnet] ./configure begginning autoconfiguration process for libnet-1.1.2.1... 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 for gawk... gawk checking whether make sets $ (MAKE)... yes checking whether to enable maintainer -specific portions of Makefiles... no checking for gcc... gcc checking for C compiler default output... 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 gcc accept -g ... yes checking for gcc option to accept ANSI C ... non needed checking for style of include used by make ... GNU checking dependency style of gcc ... non checking for a BSD - compatible install ... /usr/bin/install -c checking for ranlib ... ranlib checking how to run the C preprocessor ... gcc -E checking for a egrep ... grep -E checking for ANSI C header files ... yes checking for sys/types.h ... yes checking for sys/stat.h ... yes checking for stdlib.h .. yes checking for string.h ... yes checking for memory.h ... yes checking for inttypes.h ... yes checking for unistd.h ... yes checking sys/sockio.h usability ... no checking sys/sockio.h presence ... no checking for sys/sockio.h ... no checking machine endianess ... lil checking if unaligned accesses fail ... no checking whether gcc needs - traditional ... no checking for strerror ... yes checking link-layer packet interface type ... found linux primitives checking for packet socket (PF_SOCKET) ... yes checking for linux proc filesystem... yes scanning available packet costrucion modules: 802.1q 802.1x 802.2 802.3 arp bgp cdp data dhcp dms ethernet fddi gre icmp igmp ip ipsec isl link mpls ntp ospf rip rpc sebek snmp stp tcp token-ring udp vrrp checking net/ethernet.h usability ... yes checking net/ethernet.h presence... yes checking for net/ethernet.h... yes configure: creating ./config.status config.status: creating Makefile config.status: creating src/Makefile config.status: creating include/Makefile config.status: creating include/libnet/Makefile config.status: creating sample/Makefile config.status: creating version.h config.status: creating include/libnet.h config.status: creating libnet-config config.status: creating include/config.h config.status: include/config.h is unchanged config.status: execunting depfiles commands config.status: executing default commands