httpd.conf:

# LoadModule foo_module modules/mod_foo.so
LoadModule php5_module          modules/libphp5.so
LoadModule mod_rewrite          modules/mod_rewrite.so
#
#AddModule mod_rewrite.c

~~~~~~~~~~
Note that I get same error with our without the "AddModule mod_rewrite.c"
~~~~~~~~~~

bzitzow$ ls -al modules | grep mod_rewrite
-rw-r--r--    1 root  admin    118336 Jun  5 17:19 mod_rewrite.so

bzitzow$ /www/bin/httpd -k start
httpd: Syntax error on line 54 of /www/conf/httpd.conf: Can't locate API module structure `mod_rewrite' in file /www/modules/mod_rewrite.so: undefined symbol

UPDATE - ALL .SO files in modules directory:
bzitzow$ ls -l modules/*so
-rwxr-xr-x   1 root  admin  13574968 May 13 02:26 modules/libphp5.so
-rw-r--r--   1 root  admin    118336 Jun  5 17:19 modules/mod_rewrite.so

I obtained the mod_rewrite.so from a different directory:
bzitzow$ cp /opt/apache2/modules/mod_rewrite.so mod_rewrite.so

UPDATE 2
!!!!!!!!!!

bzitzow$ locate libphp5.so
/opt/zimbra/httpd-2.0.54/modules/libphp5.so
/sw/src/php-5.2.1/libs/libphp5.so
/sw/src/php-5.2.2/libs/libphp5.so
/usr/local/php5/libphp5.so
/www/modules/libphp5.so

bzitzow$ locate mod_rewrite.so
/apps/sugarcrm/apache2/modules/mod_rewrite.so
/opt/apache2/modules/mod_rewrite.so
/usr/libexec/httpd/mod_rewrite.so


UPDATE 3
!!!!!!!!!!!!!
The config.nice file in the /www/build/ directory:
!!!!!!!!!!!!!

! /bin/sh
#
# Created by configure

CFLAGS="-arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk"; export CFLAGS
"./configure" \
"--enable-layout=Ajay" \
"--with-ssl=/usr" \
"--enable-ssl" \
"--enable-dav" \
"--enable-cache" \
"--enable-proxy" \
"--enable-shared" \
"--disable-static" \
"--disable-unique-id" \
"--disable-ipv6" \
"--disable-env" \
"--disable-userdir" \
"--disable-autoindex" \
"" \
"CFLAGS=-arch i386 -isysroot /Developer/SDKs/MacOSX10.4u.sdk" \
"build_alias=" \
"host_alias=" \
"target_alias=" \
"$@"

!!!!!!!!!!
Update 4
!!!!!!!!!!

bzitzow$ ls -al /www/build/
total 520
drwxr-xr-x   15 root  admin     510 Apr 14 14:34 .
drwxr-xr-x   17 root  admin     578 Apr 25 04:14 ..
-rw-r--r--    1 root  admin    6127 Apr 14 14:34 apr_rules.mk
-rwxr-xr-x    1 root  admin     520 Apr 14 14:34 config.nice
-rw-r--r--    1 root  admin    2515 Apr 14 14:34 config_vars.mk
-rwxr-xr-x    1 root  admin    2860 Apr 14 14:34 instdso.sh
-rw-r--r--    1 root  admin    1060 Apr 14 14:34 library.mk
-rwxr-xr-x    1 root  admin  207759 Apr 14 14:34 libtool
-rw-r--r--    1 root  admin     951 Apr 14 14:34 ltlib.mk
-rw-r--r--    1 root  admin    2991 Apr 14 14:34 make_exports.awk
-rw-r--r--    1 root  admin    1023 Apr 14 14:34 make_var_export.awk
-rwxr-xr-x    1 root  admin    1660 Apr 14 14:34 mkdir.sh
-rw-r--r--    1 root  admin    1032 Apr 14 14:34 program.mk
-rw-r--r--    1 root  admin    6970 Apr 14 14:34 rules.mk
-rw-r--r--    1 root  admin    1258 Apr 14 14:34 special.mk