php mcrypt.so error

Hi,

I have php 5.2.10 running with old mcrypt module, I installed new version of mcrypt using rpm

php-mcrypt-5.2.10-1.i686.rpm

it created an so file in /usr/lib/php/modules, where all other php modules are installed.

Now I am getting following error

[root@linode modules]# php -v

PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/mcrypt.so' - libltdl.so.3: cannot open shared object file: No such file or directory in Unknown on line 0

PHP 5.2.10 (cli) (built: Nov 13 2009 11:24:03)

What can be the issue? Please let me know.

Thanks

Richard