I need to install php-mcrypt on my CentOS 5.5 VPS, When I try yum install php-mcrypt, it says that it is set to be updated which implies that it is already installed. I looked in the /usr/lib/php/modules and cant find the .so file.

Anyway I want to update it but yum is giving the following error, I am running PHP-FPM on Nginx.

Last login: Thu Apr 21 12:13:30 2011 from cpc2-seve18-2-0-cust438.13-3.cable.virginmedia.com
[root@infinity ~]# yum install php-mcrypt
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-mcrypt.i386 0:5.1.6-15.el5.centos.1 set to be updated
--> Processing Dependency: php-api = 20041225 for package: php-mcrypt
--> Processing Dependency: php >= 5.1.6 for package: php-mcrypt
--> Running transaction check
---> Package php.i386 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Dependency: php-common = 5.1.6-27.el5_5.3 for package: php
--> Processing Dependency: php-cli = 5.1.6-27.el5_5.3 for package: php
---> Package php-mcrypt.i386 0:5.1.6-15.el5.centos.1 set to be updated
--> Processing Dependency: php-api = 20041225 for package: php-mcrypt
--> Running transaction check
---> Package php.i386 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Dependency: php-common = 5.1.6-27.el5_5.3 for package: php
---> Package php-cli.i386 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Dependency: php-common = 5.1.6-27.el5_5.3 for package: php-cli
---> Package php-mcrypt.i386 0:5.1.6-15.el5.centos.1 set to be updated
--> Processing Dependency: php-api = 20041225 for package: php-mcrypt
--> Finished Dependency Resolution
php-mcrypt-5.1.6-15.el5.centos.1.i386 from extras has depsolving problems
  --> Missing Dependency: php-api = 20041225 is needed by package php-mcrypt-5.1.6-15.el5.centos.1.i386 (extras)
php-5.1.6-27.el5_5.3.i386 from base has depsolving problems
  --> Missing Dependency: php-common = 5.1.6-27.el5_5.3 is needed by package php-5.1.6-27.el5_5.3.i386 (base)
php-cli-5.1.6-27.el5_5.3.i386 from base has depsolving problems
  --> Missing Dependency: php-common = 5.1.6-27.el5_5.3 is needed by package php-cli-5.1.6-27.el5_5.3.i386 (base)
Error: Missing Dependency: php-api = 20041225 is needed by package php-mcrypt-5.1.6-15.el5.centos.1.i386 (extras)
Error: Missing Dependency: php-common = 5.1.6-27.el5_5.3 is needed by package php-cli-5.1.6-27.el5_5.3.i386 (base)
Error: Missing Dependency: php-common = 5.1.6-27.el5_5.3 is needed by package php-5.1.6-27.el5_5.3.i386 (base)
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest
The program package-cleanup is found in the yum-utils package.
[root@infinity ~]#

Any ideas?