IBM users must have OpenGL installed and activated on their computer in order to use C-MOLD 98. OpenGL is used to improve the graphics performance of the Visualizer. With the IBM RS/6000's default configuration, the display images covered by a pull-down menu do not restore automatically after the menu closes. This problem is solved by enabling the backing-store feature on the window manager.

XDM Users

1. To enable the OpenGL extensions to the X window manager and the backing store features, edit /usr/lib/X11/xdm/Xservers and add -bs -x GLX -x abx -x mbx to the server command line at startup. After adding these options, the line should look something like:
   $ :0 local /usr/bin/X11/X -T -force -bs -x GLX -x abx -x mbx

   After making the changes, kill the /usr/bin/X11/X process in order to get the changes recognized. Consult the README file in the /usr/lpp/GL or /usr/lpp/OpenGL directory for more information about enabling OpenGL on your IBM computer. OpenGL is a licensed program product of IBM.

1. Locate the file /usr/lib/X11/defaults/xserverrc and add the following line:
   $ :0 local /usr/bin/X11/X -T -force -bs

   In the file find this line

   $ EXTENSIONS=""

   and change it to

   $ EXTENSIONS="-x GLX -x abx -x mbx"

   After making the changes, kill the /usr/bin/X11/X process in order to get the changes recognized. Consult the README file in the /usr/lpp/GL or /usr/lpp/OpenGL directory for more information about enabling OpenGL on your IBM computer. OpenGL is a licensed program product of IBM.