missing include files

[root]

SCO XENIX 286 V 2.2.3

In trying to rebuild the kernal using the makefile supplied
in /usr/sys/conf, I'm getting the error message:

   space.c
   ../h/emap.h(10): fatal error 15: Cannot find `sys/emap.h'
   Error Code 1
   STOP

I've checked /usr/include/sys and find that the files,
eio.h, emap.h and sess.h are missing.  (Compaired against
the perms list).  They are not on any of my install disks -
Any ideas as to what's up?  Could someone e-mail me these 3
files?
Thanks in advance....

Scotty
{ames,rutgers,texsun,smu}!attctc!ozdaltx!sysop