1. Requirements

Before you can either compile or execute a binary distribution of X11R6.8.1, the following conditions must be met:

• Ensure that you are running Release 5.0.4 or later. This is required because OSS646 is only supported on those platforms. There are no plans to support X11R6.8.1 on earlier releases of OpenServer.
• Ensure that OSS646, the ``Execution Environment Update'' package is installed, if appropriate. Check the release notes for that update to see whether or not your current operating system requires this update. At least version OSS646B is required. If you are running SCO OpenServer Release 5.0.7, you must have Maintenance Pack 1 installed.
• Ensure that the "Graphics, Web and X11 Libraries" package is installed. At least version 1.3.2Ag is required. You should always install the latest possible version of this supplement that is valid for your operating system release. From time to time this release is bundled with Maintenance Packs, so if you are running 5.0.7 or later, the latest version may be in the latest Maintenance Pack. Always check the release notes for GWXLIBS to see if your platform requires the update. The latest version can always be found at the SCO FTP site.
• To compile X11R6.8.1, you must use the SCO-supported version of the GNU C Compiler. It is possible that Skunkware versions of the compiler will work too, but this has not been tested. The ``GNU Development System'' is available for all releases from (and including) SCO OpenServer Release 5.0.5. It is provided with the operating system in all versions from Release 5.0.7, although you need to run ``custom'' to install it from the media. You can always download the latest latest version of the GNU Development System from the SCO FTP site.
• If you are not using OSR 5.0.7 or later, you need to get an updated console driver. See urlnam for details on OpenServer supplements. If you can't or don't want to upgrade your console driver, X11R6.8.1 will still compile, but you may run into problems with some cards such as the Riva TNT and ATI Rage cards. The problem with the console driver in 5.0.6A and earlier is that when the X server sets graphics mode, the driver does not set a status bit, so any text that is sent directly to /dev/console, such as kernel warning or notice messages when you access tape drives or NFS notices, will be sent to the console video memory. This just happens to be slap bang in the middle of palette data for the Riva TNT, so you get color map corruption. The updated console driver also has an improved mechanism for allocating video memory that X11R6.8.1 detects at compile time, and it will use it if it exists. It is STRONGLY recommended that you get the console driver update.