The make/configure output are here: 
 
http://www.lerctr.org/~ler/php/qa-out.txt 
 
The size is: 
$ ls -l qa* 
-rw-r--r--    1 ler      isis         211699 Dec 23 19:33 
qa-out.txt 
$ 
 
I can supply an account on request for this box.

I tried the 4.3.0 release tarball, and similar results.  
 
The make.out for it is at: 
 
http://www.lerctr.org/~ler/php/make.4.3.0.out.txt 
 
It's size is: 
 -rw-r--r--    1 ler      isis         183136 Dec 27 10:35 
make.4.3.0.out.txt 
 
 
My offer stands to give an account to ANY PHP team member 
to figure out what's going on here.

I found the cause of the problem (in mod_php4.c):

#undef shutdown 

which was added in revision 1.69 with commit message:

UnixWare defines shutdown to _shutdown, which causes problems lateron 
when using a structure member named shutdown. Since this sourcefile does 
not use the system call shutdown, it is safe to #undef it.PR: #6008, 
#6362 (those reports point to UnixWare 7.1.0).

The funny thing is that if I remove the "#undef shutdown" it compiles 
fine (except for this warning:

*** Warning: inter-library dependencies are not known to be supported.
*** All declared inter-library dependencies are being dropped.

*** Warning: libtool could not satisfy all declared inter-library
*** dependencies of module libphp4.  Therefore, libtool will create
*** a static module, that should work as long as the dlopening
*** application is linked with the -dlopen flag.
)

I think it would be safe to remove the undef, but we will break 
something on Unixware 7.1.0 with that most likely but we fix the problem 
on Unixware 7.1.3.

This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.

Warnings and errors are fixed in CVS, libtool error remains:

*** Warning: inter-library dependencies are not known to be supported.
*** All declared inter-library dependencies are being dropped.

*** Warning: libtool could not satisfy all declared inter-library
*** dependencies of module libphp4.  Therefore, libtool will create
*** a static module, that should work as long as the dlopening
*** application is linked with the -dlopen flag.