Dear SCO Customer,

Support Level Supplement (SLS) OSS646C, the Execution Environment Supplement,
updates the UNIX Runtime System (RTS) and Development System on SCO OpenServer
Release 5.0.6.  This version of the supplement contains several fixes to the
shared C library (libc.so.1), as well as header file fixes and new C and C++
startup modules that improve gABI compliance.  It also includes all of the new
libraries (such as the shared math and curses libraries) that were introduced 
in Release 5.0.7.  

ELF programs that are developed on an SCO OpenServer Release 5.0.7 system or 
on a system where OSS646C is installed require that pre-Release 5.0.7 systems 
where the binary will run also have OSS646C installed.

Since this supplement patches portions of the SCO OpenServer Development
System, that package must be installed prior to installing this supplement, if
you want to use the Development System with this supplement.  If you do decide
to install the Development System after installing OSS646C, then you must
re-apply OSS646C after the Development System has been installed in order to
install the Development System portions of this supplement.

This supplement can be installed on the following SCO OpenServer release:

     SCO OpenServer Release 5.0.6 with RS506A

Note:

The following libc calls will not function correctly
without kernel modifications:
   - setproctitle() 
   - getproctitle() 



Installation Instructions
-------------------------

To install OSS646C follow these steps:

  1. Download the OSS646C media image files to a secure location.

     a) As root, change directory to the patch storage area: 
           
          # cd /local/patches 
 
        If this directory does not exist on your system, 
        create it as follows: 
           
          # mkdir /local/patches 
          # chmod 700 /local/patches 
           
     b) Download the OSS646C media image (VOL) files from: 

          ftp://ftp.sco.com/pub/openserver5/oss646c
             
        to the patch storage area (/local/patches).   

  2. Run the Software Manager with the command:

       # scoadmin software

     or double-click on the Software Manager icon in the desktop.

  3. Pull down the "Software" menu and select "Install New".

  4. When prompted for the host from which to install, choose the local machine
     and then "Continue".

  5. In the "Select Media" menu, pull down the "Media Device" menu.  Select
     "Media Images", then choose "Continue".

  6. When prompted for the "Image Directory", enter "/local/patches"
     and choose "OK".

  7. When prompted to select software to install, make sure that the "OSS646C"
     entry is highlighted.  Choose "Install".
 
  8. Once the installation completes, exit the Software Manager by
     selecting "Exit" from the "Host" menu.

  9. It is necessary to reboot the server for the supplement 
     to take effect. 


Removal Instructions
--------------------

1. Log in as root.

2. Execute the command:

        # scoadmin software

   or double-click on the Software Manager icon in the desktop.

3. Highlight "OSS646C - Execution Environment Supplement".

4. Pull down the "Software" menu and select "Remove Software".

5. Once the removal finishes, quit the Software Manager.  

6. It is necessary to reboot the server for the removal of
   SLS OSS646C to be complete.

If you have questions regarding this SLS, or the product on which
it is installed, please contact your software supplier.

__________________________

Copyright (C) 2004 The SCO Group, Inc. All Rights Reserved