What are uccs and syshead, the OUDK Optimizing C Compilation System and System Header File Update packages for Update Pack 4?

KEYWORDS: update pack 4 unixware 7.1.3 713 up4 uccs syshead 

RELEASE:  SCO Unixware Release 7.1.4

PROBLEM:  What are uccs and syshead, the OUDK Optimizing C 
          Compilation System and System Header File Update packages 
          for Update Pack 4 and when should I install them?

SOLUTION: With the introduction of NSS, SCO has changed some 
          existing APIs and added support for new APIs to support
          NSS. Customers building binaries that use these APIs who have 
          upgraded to UnixWare 7.1.4 using Update Pack 4 
          will find that their compile will fail with undefined
          symbol references similar to the following:

          Undefined                       first referenced 
          symbol                              in file 
          getspnam_r                          libperl.so 
          getpwent_r                          libperl.so 
          getgrent_r                          libperl.so 
           
          Customers experiencing these problems should either:

          1) Install the UnixWare and OpenServer Development Kit (UDK) 
          which is available to download from:

          http://www.sco.com/support/update/download/uw713up.html

          For details on how to install the UDK please see the Release 
          notes at the URL above, or,

          2) Install the uccs and syshead packages which are available
          to download from:

          http://www.sco.com/support/update/download/uw713up.html

          To install the uccs and syshead packages, as root:

          1) Download the packages to /usr/tmp/

	  2) Install the packages using:

          # pkgadd -d /usr/tmp/uccs.image
          # pkgadd -d /usr/tmp/syshead.image