UPDATE 2:
njstaticuser mentioned he would like to know where to get this file below: I believe the file should be in /opt/local/var/macports/build/ – there should be a folder called _opt_local_var_macports_sources_rsync.macports.org_release_ports_<ettercap-ng> where <ettercap-ng> will be something like “net_ettercap-ng” (I don’t know the exact name because it has been cleaned from that directory). Under this directory there will be another directory called “work” and under the work directory will be another directory named after the ettercap dist file. Inside this directory you’ll want to look under src/interfaces/curses/widgets/ for the wdg.h and wdg.c files.

If all else fails, run “sudo find /opt/local/var/macports/build -name "wdg.*" -print” and it should print the locations of the files. NOTE: These files will only exist *after* attempting the build with macports, so attempt to build first (sudo port install ettercap-ng), and then look for the files. Hope this helps!

UPDATE:
After talking to people in IRC, I found the real root of this problem, wdg.h and wdc.h need to have #include <sys/types.h> included at the top of the file. At this time, I recommend you attempt the install using MacPorts by doing sudo port install ettercap-ng, let it fail, then go into the directory containing the macports build source, add the include into the 2 files, then run sudo port install ettercap-ng again, it will succeed and your copy of ettercap should work!

Thanks @ Raim in #macports and dmacks in #fink for helping track this down. You can see the bug here.

Original message below:

This is a continuation of the pthread error that I mentioned in a previous post

I finally got it working natively; you might be familiar with the following error when trying to compile ettercap-ng using either fink or natively:

gcc -DHAVE_CONFIG_H -I. -I. -I../../../../include -I/sw/include -O2 -funroll-loops -fomit-frame-pointer -Wall -I/sw/include -I/sw/include -I/sw/include -I/sw/include -g -O2 -c -o libwdg_a-wdg.o `test -f 'wdg.c' || echo './'`wdg.c
In file included from wdg.c:23:
./wdg.h:189: error: syntax error before 'u_char'
./wdg.h:189: warning: no semicolon at end of struct or union
./wdg.h:190: warning: type defaults to 'int' in declaration of 'border_color'
./wdg.h:190: warning: data definition has no type or storage class
./wdg.h:191: error: syntax error before 'focus_color'
./wdg.h:191: warning: type defaults to 'int' in declaration of 'focus_color'
etc etc, errors go on forever...

Well, after poking around in the code I was able to find where to fix the code so that it would compile. Open the directory src/interfaces/curses/widgets/ and edit the files wdg.c and wdg.h

Change all of the occurrences of “u_char” to “int” in these two files, you should now be able to compile without errors.

DISCLAIMER: I don’t know what kind of effect this will have on the curses interface, it will probably break the curses interface permanently, personally I use the text interface the entire time (so I run configure with --disable-gtk so I don’t have to deal with the hassle of installing the gtk/glib libraries), but at least you are able to compile, right?

I’ve tar’d up a patched version of the code and configure script (so you don’t get the pthread error). I am planning on hosting on navi.eight7.org, I will put it up and link to it when I’m able to access the machine (work firewall prevents it).

I’m still getting errors when ettercap tries to forward the packets, but I’m positive they are caused by linking to the wrong version of libnet, that has a different number of arguments to the libnet_write_raw_ipv4() function. If I get a fix I’ll post it here.