While incuding compat.h gcc generates warnings:

---

Compiling libsmb/clirap2.c
In file included from include/includes.h:337,
                 from libsmb/clirap2.c:81:
/usr/include/compat.h:6:2: Warnung: #warning "This header is obsolete, use 
ap_compat.h instead"
Compiling libsmb/passchange.c
In file included from include/includes.h:337,
                 from libsmb/passchange.c:21:
/usr/include/compat.h:6:2: Warnung: #warning "This header is obsolete, use 
ap_compat.h instead"
Compiling libsmb/doserr.c
In file included from include/includes.h:337,
                 from libsmb/doserr.c:23:
/usr/include/compat.h:6:2: Warnung: #warning "This header is obsolete, use 
ap_compat.h instead"

---

It seems that compat.h is a backward compatibility file from Apache.

Apache 1.3.x and Apache 2.0.x provide ap_compat.h which should be used as
vanilla Apache 2.0.x does not include compat.h any more and compilation might 
fail.

This has been observed on a RedHat 7.2 system with:

gcc-Version 3.3.2
GNU ld version 2.14 20030612
Server version: Apache/2.0.48
Server built:   Oct 29 2003 15:09:16

while building Samba 3.0.0 from http://de.samba.org/samba/ftp/samba-3.0.0.tar.
bz2

Best regards,
Lordy