Here’s how to fetch it from source, patch it and build it yourself on OSX (tested on 10.5.3). First we need to check out the source:

shell> cvs -z3 -d:pserver:anonymous@cvs.savannah.gnu.org:/sources/screen co screen

Next, we need to manually apply the patches from MacPorts (assuming you’ve used MacPorts before). First change into the screen directory and apply the following 3 patches:

shell> cd screen/src
shell> patch < /opt/local/var/macports/sources/rsync.macports.org/
release/ports/sysutils/screen/files/patch-maxargs
shell> patch < /opt/local/var/macports/sources/rsync.macports.org/
release/ports/sysutils/screen/files/patch-windowsize
shell> patch < /opt/local/var/macports/sources/rsync.macports.org/
release/ports/sysutils/screen/files/patch-pty.c

(Each of those should be on one line, I had to split them up to make the wrapping better).

Now, configure using the same method as the macports:

shell> ./configure --enable-locale --enable-telnet --enable-colors256 --enable-rxct_osc

From there, you should be able to do a make and make install to get your screen up and running. Vertical-split is bound to ctrl+a – |  (control-a and pipe) (substitute whatever your bind key is for ctrl+a). Then you can use ctrl+a – :resize <x> to resize the window, where <x> is x%, -x, +x or x. Here’s a screenshot of it in action:

If you get this error:

cc -I. -I../libpcap-0.7.1 -DLINUX -D__FAVOR_BSD -D_LARGEFILE_SOURCE=1 -D_FILE_OFFSET_BITS=64 -L../libpcap-0.7.1 -c stat.c
cc -I. -I../libpcap-0.7.1 -DLINUX -D__FAVOR_BSD -D_LARGEFILE_SOURCE=1 -D_FILE_OFFSET_BITS=64 -L../libpcap-0.7.1 -c net_read.c
net_read.c:74:1: warning: "__FAVOR_BSD" redefined
<command line>:1:1: warning: this is the location of the previous definition
net_read.c:149: error: static declaration of ‘packet_length’ follows non-static declaration
tcpdstat.h:415: error: previous declaration of ‘packet_length’ was here
make: *** [net_read.o] Error 1

Edit the net_read.c file and change line 149 from this:

static int packet_length; /* length of current packet */

to this:

int packet_length; /* length of current packet */

Simple eh? Just type “make” again and tcpdstat should compile just fine. Simple fix.

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.