First off,  there is a start of  an OS/2 port,  but it's too  incomplete.  So I
decided to try the  X-Window version,  and I was able to compile it  (including
sample and the not working  wxBuilder) in about two days work. 
Notice there are possibly other ways, such as trying poring the Windows version
using Open32,  or waiting for GTK to be ported and then use the GTK version, so
if anyone wants to volounteer...
This version works with Motif  (well,  actually I'm using lesstiff);  XView has
not been tryed, so it may require a little more patching.

                                 INSTALLATION

The steps to take are more or less the followings: 
 
1) Install the EmX runtime;  this is required to run all UNIX-ports, so chances
   are you already  have it.
2) Install GNU sed,  GNU yacc, GNU flex and the GNU file utils.  All these must
   be available on your path.  Notice that, you may also need to rename or copy
   the executable, if its name is different (e.g. sedOS2.EXE).
3) If you  don't already use it,  get gcc for EmX and set it up;  you will need
   C++, the standard  C++ library and the bsddev package.  You'll also need GNU
   Make. Again both of these should be available on your path.
4) Of course,  you should also install  X-Free86/OS2 (including the developer's
   package).
5) The paths in the makefiles are all junks  (you typically don't have usr/...,
   etc...). Changing the makefile is not useful, because I can't know where you
   installed all of your programs.  This is not a problem, however,  as long as
   you have all the appropriate include  and library paths set up in config.sys
   (see the gcc manuals for this). 
6) 'SET gccopt=-Zmtd -D__ST_MT_ERRNO__'.  This is  needed  to  compile all  OS/2
   X-Window programs. 
   'SET emxopt=-hNN',   where   NN   is   a   large   enough   integer  number.
   This is because EmX  by default allows 40 file handles per program,  and you
   will probably  run out when building the samples.  I chosed a value of  6000   
   for NN, which is probably largely more than enough,  but I don't think there
   is any drawback or side-effect. Again, see the gcc manuals for details.
7) Install a UNIX shell  (I used Korn, but any other probably works).  You must
   set  OS2_SHELL   and  COMSPEC  to  point  to  ksh.exe  before  running  make
   (I strongly advise not  to change  these globally in config.sys,  but rather
   locally in the  current OS2 prompt).  This is because the makefile  uses the
   CD command with forward slashes,  while not encolsing the path in quotes, so
   CMD.EXE does not understand it.
8) Now, from the UNIX shell, you can 'make -f makefile.OS2X motif' in the src/x
   directory.  This will build the library.
9) You can build the samples,  the same way.  However,  what you'll end up with
   are ????_motif  files with no extension.  You must 'emxbind' these to obtain
   the executables.

Note:  The latest versions of gcc for EmX do  not prepend 'lib' to names of the
library you link with;  so, for example, in the UNIX makefile  libwx_motif.a is
created, but the samples gcc ends up searching wx_motif.a.  This did not happen
with older version of gcc.
MakeFile.OS2 have been modified to produce wx_motif.a.  If you use old versions
of gcc, you'll have to modify the makefile back.

Please,  if you  try this,  let oter users  know about  problems or  issues you
encounter. This has not been tested thoroughly, so there may still be things to
fix.

                          Changes in the source files

Here is a description of all changes made to the source files, just in case you
care.

a) Makefile.OS2 have been derived from  Makefile.unx,  but include makeos2.env,
   instead of make.env.
b) makeos2.env has been derived from make.env, with the following changes:  the
   C++ compiler is gcc, not g++; lex points to flex; ranlib doesn't exist;  the
   standard  C++ library is called  stdcpp,  not  stdc++; socket.lib  had to be
   linked with.
c) in wx_imgx.h sys_errlist definition has been changed  to match the on in the
   gcc headers.
d) in many places some  #if  have been changed  to alter  #inlcusion  of system
   headers (we test wether __EMX__ is defined, in order to find out if  OS/2 is
   being  used).  Most times the  default is good enough,  though,  so I didn't
   change all.
e) wrong  #ifs  make the compiler think  he doesn't have the  sleep()  function
   available,  and the surrogate  doesn't compile.  That function is there,  so
   the conditionals have been changed. 
f) in wb_utils.cpp I enabled the VMS definition for strcascmp  and  strncasecmp
   (again __EMX__ is tested).
g) in prologio's makefile.os2  lex.yy.c  had to be replaced with  lexyy.c,  and
   bin/rm with rm.

Andrea Venturoli: a.ventu at flashnet.it