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That was a waste of time.  I mis read  sys/types.h on
OpenServer
u_int  and u_short are not defined because they are warped
inside
#if !defined(_XOPEN_SOURCE) && !defined(_POSIX_SOURCE)
#endif /* !defined(_XOPEN_SOURCE) && !defined(_POSIX_SOURCE)
*/

The error is
"/usr/include/sys/socket.h", line 171: error: Syntax error
before or at: u_short
"/usr/include/sys/socket.h", line 171: error: cannot recover
from previous errors

....
167:/*
168: * Structure used by kernel to store most addresses.
169: */
170:struct sockaddr {
171:    u_short         sa_family;      /* address family */
172:    char            sa_data[14];    /* up to 14 bytes of
direct address */
173:};
174:
....

I've modified the patch to be less obtrusive my undefing
_XOPEN_SOURCE 
on OpenServer only. We may end up removing the confdefs2.h
parts later
if we end up using define_xopen_source=no for OpenServer. As
it  stands
now, with or without this patch, OpenServer doesn't build.
This patch is
really for SVR4.2 and  SVR5 systems. (Ie. UnixWare)