Problems with php install and apache2 start

["Dr. Md. Aminul Islam Khan" <aikhan_lab@xxxxxxxxx>]

Hi,
Wanted to use: Postgresql-9.0rc1, httpd-2.2.16 & php-5.3.3 on ubuntu
9.04
-Installed Postgresql-9.0rc1: Succeeded
-Installed httpd-2.2.16: Succeed (./configure --with-so)
-Installed php-5.3.3: Succeeded(./configure --with-apxs2=path to apxs
--with-pgsql --with-pdo-pgsql)

Checked: httpd.conf for LoadModule php5_module   modules/libphp5.so  
(Its present)
Then to start apache2: /usr/local/apache2/bin/apachectl -k start
Message given: httpd: Syntax error on line 53
of /usr/local/apache2/conf/httpd.conf: Cannot \
load /usr/local/apache2/modules/libphp5.so into \
server: /usr/local/apache2/modules/libphp5.so: undefined symbol: \
__res_nsearch

Where am I wrong? How to proceed?
Help is highly appreciated.
Thanks in advance.

aikhan