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Re: Building nmap/ncat on Ubuntu
From: Corey Chandler <lists () sequestered net>
Date: Tue, 12 May 2009 18:22:55 -0700

David Fifield wrote:
On Tue, May 05, 2009 at 08:58:20PM -0700, Corey Chandler wrote:
So I finally took the plunge, and dipped my toes into the Ubuntu river (so that makes nmap test environments of MacOS X, FreeBSD, CentOS, and now Ubuntu-- phew!). My own opinions aside, I'm having a bit of difficulty getting nmap to compile from SVN-- it chokes on what looks like a flex error, but flex is already installed; any advice would be appreciated.

I've already installed gcc-g++, bison, openssl's development libraries, and flex (as a shot in the dark):

../libpcap/libpcap.a(gencode.o): In function `pcap_compile':
/home/jchandler/sources/nmap/libpcap/./gencode.c:382: undefined reference to `lex_init' /home/jchandler/sources/nmap/libpcap/./gencode.c:384: undefined reference to `pcap_parse' /home/jchandler/sources/nmap/libpcap/./gencode.c:401: undefined reference to `lex_cleanup' /home/jchandler/sources/nmap/libpcap/./gencode.c:368: undefined reference to `lex_cleanup'
../libpcap/libpcap.a(grammar.o): In function `yyparse':
/home/jchandler/sources/nmap/libpcap/y.tab.c:1877: undefined reference to `yylex'
collect2: ld returned 1 exit status
make[1]: *** [ncat] Error 1
make[1]: Leaving directory `/home/jchandler/sources/nmap/ncat'
make: *** [ncat_build] Error 2
jchandler () Conscience:~/sources/nmap$

Maybe try "make distclean" in libpcap and reconfigure. If that doesn't
work, "make distclean" again, reconfigure, then "touch scanner.c". That
ought to keep scanner.c from being regenerated.
Thanks-- JUST sorted this out an hour ago, actually-- your timing is spooky. The problem was that I didn't have a complete set of buildtools installed-- didn't realize the packages were named slightly differently than on CentOS / Fedora / RHEL. Thanks for following up, though!

Corey Chandler / KB1JWQ
Living Legend / Systems Exorcist
Today's Excuse: somebody was calculating pi on the server

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