All SCSI tapes were removed from the system using 'mkdev tape'.
          Now, when the /etc/conf/cf.d/link_unix command is run to relink
          the kernel, it fails with error messages similar to the following:

    The UNIX Operating System will now be rebuilt.
    This will take a few minutes.  Please wait.

    Root for this system build is /

    "/var/opt/K/SCO/link/1.1.0Eb/etc/conf/pack.d/Stp/space.h", line 63:
    Syntax error
    "/var/opt/K/SCO/link/1.1.0Eb/etc/conf/pack.d/Stp/space.h", line 65:
    warning: sizeof returns 0
    "/var/opt/K/SCO/link/1.1.0Eb/etc/conf/pack.d/Stp/space.h", line 70:
    Syntax error

    ERROR: '/var/opt/K/SCO/link/1.1.0Eb/etc/conf/pack.d/Stp/space.c'
    will not compile properly

    i386ld stubs.o fatal: Can't open file
    /var/opt/K/SCO/link/1.1.0Eb/etc/conf/pack.d/Stp/space.o for input

    ERROR: Can not link-edit unix

    idbuild: idmkunix had errors.
    System build failed.

          This problem was fixed in Release Supplement 504C for SCO
          OpenServer 5.0.4 (rs504c).

          However, if you have rs504c installed on the system and the
          kernel still fails to relink, follow the instruction below to 
          correct the problem.

          In order to correct this problem, run 'mkdev tape' and add a
          SCSI tape drive.  In order to save time, do not choose to relink
          the kernel. Note that you may be unable to add a second device
          at the original device parameters. If this is the case, then use
          a different scsi id, bus or lun to add the drive.

          Edit the file /etc/conf/sdevice.d/Stp and delete the second line.

          Then, run 'mkdev tape' again and remove the SCSI tape drive.
          Relink the kernel.

          Technical Article 105811, "What is the Release Supplement 504C for SCO
          OpenServer Release 5.0.4 (rs504c) and how can I obtain it?"