vanilla centos with latest updates, installed gcc, and after ./configure:.... Configuration complete. Type make (or gmake on some *BSD machines) to compile. [root@winxp nmap-5.51]# make Makefile:375: makefile.dep: No such file or directory g++ -MM -I./liblua -I./libdnet-stripped/include -I./libpcre -I./libpcap -I./nbase - I./nsock/include -DHAVE_CONFIG_H -DNMAP_NAME=\"Nmap\" -DNMAP_URL=\"http://nmap.org\" - DNMAP_PLATFORM=\"x86_64-unknown-linux-gnu\" -DNMAPDATADIR=\"/usr/local/share/nmap\" - D_FORTIFY_SOURCE=2 main.cc nmap.cc targets.cc tcpip.cc nmap_error.cc utils.cc idle_scan.cc osscan.cc osscan2.cc output.cc payload.cc scan_engine.cc timing.cc charpool.cc services.cc protocols.cc nmap_rpc.cc portlist.cc NmapOps.cc TargetGroup.cc Target.cc FingerPrintResults.cc service_scan.cc NmapOutputTable.cc MACLookup.cc nmap_tty.cc nmap_dns.cc traceroute.cc portreasons.cc xml.cc nse_main.cc nse_utility.cc nse_nsock.cc nse_dnet.cc nse_fs.cc nse_nmaplib.cc nse_debug.cc nse_pcrelib.cc nse_binlib.cc nse_bit.cc > makefile.dep /bin/sh: g++: command not found make: *** [makefile.dep] Error 127 [root@winxp nmap-5.51]# yum install g++ -y Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * addons: mirror.ash.fastserv.com * base: centos.mirror.choopa.net * extras: mirror.trouble-free.net * updates: mirror.nexcess.net Setting up Install Process No package g++ available. Nothing to do [root@winxp nmap-5.51]#