The UW2compat.pkg package contains:
 
UW2compat       UDK Compatibility Module for UnixWare 2.1.3
                (IA32) 7.1.1

The UDK Compatibility Module is provided and supported by SCO.
This module allows applications developed on SCO Unixware 7 to
run on SCO Unixware 2.1.x systems.