This documents lists some of the important points to be considered while 
installing ACE+TAO on Redhat Linux systems.

General Points
--------------

1. ACE and TAO both should be compiled with same versions of gcc 
   compiler. Because different versions of gcc may not be binary 
   compatible with each other e.g. gcc2.96.81 and gcc3.0.2

   This creates problems because dynamic libraries of ACE are also used 
   by TAO. So they both must be binary compatible.

2. If you want to undo the compilation of some version of gcc which is 
   not proper, you should issue "make realclean" instead of "make clean" 
   which removes dynamic libraries also.

Two versions of gcc side by side
--------------------------------

1. Download the tarball of the newer version from 
   http://gcc.gnu.org/releases.html and unzip and untar it. 

2. Follow the installation guidelines on the above site (recommended), or 
   see below for a short description:
  
   i.   Change to gcc-x.x.x directory and type "configure".
   ii.  Type "make bootstrap".
   iii. Type "make install".

   This will install gcc and put binaries in /usr/local/bin directory and 
   libraries in /usr/local/lib which are chosen by default by the installer.

3. Now you have two versions of gcc installed in your system. The older 
   version will have it's binaries in /usr/bin and libraries in /usr/lib 
   directories. These are the default directories searched for binaries 
   and libraries. So still a quick "gcc -v" will show older version in 
   effect.

4. To make newer version effective, add /usr/local/bin in PATH before  
   /usr/bin. This makes newer binary effective.

5. Add an entry for /usr/local/lib in /etc/ld.so.conf and run ldconfig. 
   This will reconfigure the Loader to search /usr/local/lib also for 
   library files. 

6. Now "gcc -v" should show newer version and it will link to newer 
   libraries.