PHP install error

Hello,

Platforms:
AIX 5.3.10 - Apache 2.2.14 - PHP 5.2.11 - DB2/UDB 9.7

I received this error after running:
./configure --with-apxs2=/usr/opt/apache2/bin/apxs
--with-ibm-db2=/data/db2/db2inst1/sqllib
--sysconfdir=/usr/opt/apache2/conf

+--------------------------------------------------------------------+
|                       *** ATTENTION ***                            |
|                                                                    |
| Something is likely to be messed up here, because the configure    |
| script was not able to detect a simple feature on your platform.   |
| This is often caused by incorrect configuration parameters. Please |
| see the file debug.log for error messages.                         |
|                                                                    |
| If you are unable to fix this, send the file debug.log to the      |
| [email protected] mailing list and include appropriate      |
| information about your setup.                                      |
+--------------------------------------------------------------------+

Also, I tried to look at the debug.log file and could not fix this
issue. I
have attached the debug.log file...Please help

Thank you

CONFIGURE:   './configure'  '--with-apxs2=/usr/opt/apache2/bin/apxs' '--with-ibm-db2=/data/db2/db2inst1/sqllib' '--sysconfdir=/usr/opt/apache2/conf'
CC:         gcc
CFLAGS:     -I/usr/include -g -O2
CPPFLAGS:   
CXX:        
CXXFLAGS:   
INCLUDES:    -I/tmp/php/php-5.2.11/ext/date/lib -I/opt/freeware/include/libxml2
LDFLAGS:    -L/usr/lib  -L/opt/freeware/lib -L/opt/freeware/lib -L/data/db2/db2inst1/sqllib/lib -L/data/db2/db2inst1/sqllib/lib
LIBS:       -lrt -lm  -lxml2 -lz -liconv -lm -lxml2 -lz -liconv -lm -ldb2 -lxml2 -lz -liconv -lm
DLIBS:      
SAPI:       apache2handler
PHP_RPATHS:  /opt/freeware/lib /data/db2/db2inst1/sqllib/lib
uname -a:   AIX OGD1S-SOUTHERN 3 5 000A84ECD600

gcc -o conftest -I/usr/include -g -O2  -L/usr/lib  -L/opt/freeware/lib -L/opt/freeware/lib -L/data/db2/db2inst1/sqllib/lib -L/data/db2/db2inst1/sqllib/lib conftest.c -lrt -lm  -lxml2 -lz -liconv -lm -lxml2 -lz -liconv -lm -ldb2 -lxml2 -lz -liconv -lm 1>&5
conftest.c: In function 'main':
conftest.c:3: warning: incompatible implicit declaration of built-in function 'exit'