installation problems (ITS#128)

[sihem@research.att.com]

when installing openldap, i have the following problems 
using ; make depend

  cd tools; make -w depend
make[4]: Entering directory `/n/fs052/didi/OpenLDAP/ldap/servers/slapd/tools'
In file included from centipede.c:11:
../../../include/ac/unistd.h:36: getopt.h: No such file or directory
In file included from centipede.c:17:
../../../include/ldbm.h:32: db.h: No such file or directory
In file included from ldbmcat.c:9:
../../../include/ldbm.h:32: db.h: No such file or directory
In file included from ldbmtest.c:11:
../../../include/ac/unistd.h:36: getopt.h: No such file or directory
In file included from ../back-ldbm/back-ldbm.h:6,
                 from ldbmtest.c:24:
../../../include/ldbm.h:32: db.h: No such file or directory
In file included from sizecount.c:6:
../../../include/ac/unistd.h:36: getopt.h: No such file or directory
In file included from sizecount.c:8:
../../../include/ldbm.h:32: db.h: No such file or directory
In file included from ldif.c:8:
../../../include/ac/unistd.h:36: getopt.h: No such file or directory
In file included from ldif2id2children.c:9:
../../../include/ac/unistd.h:36: getopt.h: No such file or directory
In file included from ../back-ldbm/back-ldbm.h:6,