to build STLport
  with Watcom you need to go through some setup &
  patching steps:
Basic procedure to install/use STLPort with Watcom v11c
1 installing 
  STLPort
  ====================
  You can install STLPort to any path you like.
  Simply uncompress the compressed archive & copy it to your chosen path.
For this discussion I have installed STLPort 4.5 directly below d:\stl\
2 Setup an 
  STLPATH environmental variable
  =========================================
  Add the following line to your Autoexec.bat. This will be used to allow 
  Watcom to find the STLPort include files.
SET STLPATH=d:\stl\STLport-4.5\stlport
3 Reboot 
  your PC
  ================
  This ensures that the STLPATH environmental variable is now part of your 
  environment.
  To check this start a DOS command line session and type SET at the prompt. You
  should see STLPATH listed.
4 Add the 
  STLPort path to your Watcom project
  =============================================
  You must have Watcom search for STLPort include files before any others. 
  If you are using the IDE, click on Option/C++ Compiler Switches and add the 
  STLPort path to the include directories.
In a typical Watcom project you will have the following in the include directories textbox:
$(%stlpath);$(%watcom)\h;$(%watcom)\h\nt
Note the use of the stlpath environmental variable, rather than an actual path. This allows you to use the same project on any PC which has STLPort, Watcom and the STLPATH environmental variable set.
5 Fixes to 
  get STLPort 4.5.3 to compile with Watcom v11c
  ========================================================
  STLPort will NOT compile 'out of the box' with Watcom v11c. The following 
  patches fix the most commonly found issues.
stlport\stl_user_config.h
  -------------------------
  line 45 remove the comment from the line:
  # define _STLP_NO_OWN_IOSTREAMS 1
stlport\stl\_string.h
  ---------------------
  line 98/99 replace:
  return find_if((_CharT*)_M_first, (_CharT*)_M_last,
  _Eq_char_bound<_Traits>(__x)) == (_CharT*)_M_last;
  with
  return find_if(_M_first, _M_last,
  _Eq_char_bound<_Traits>(__x)) == _M_last;
stlport\stl\_tree.c
  -------------------
  at or about line 37 change from:
  # define __iterator__ _Rb_tree_iterator<_Value,_Nonconst_traits<_Value>
  > # define __size_type__ size_t
  to
  # define __iterator__ _Rb_tree_iterator<_Value,_Nonconst_traits<_Value>
  >
  # define __size_type__ size_t
-- Regards 
  Kon Tantos ksoft1@attglobal.net or kon.tantos@tafe.nsw.edu.au
  
Alexander 
  M. Albertian aka Snake
  ICQ#3395322
  albertianⓐ4ip.ru
  -----------------------------------------
  Back to my OpenWatcom / Watcom C/C++ page