Отсутствует проблема с зависимостями при попытке установить расширение apc для php

Я пытаюсь установить расширение apc для php согласно этому руководству: http://2bits.com/articles/installing-php-apc-gnulinux-centos-5.html но не может успешно запустить первую команду. Вот что я получаю:

Loaded plugins: fastestmirror
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Repository contrib is listed more than once in the configuration
Determining fastest mirrors
Plesk                                                    |  951 B     00:00
Plesk-Third-Party                                        |  951 B     00:00
base                                                     | 1.1 kB     00:00
extras                                                   | 2.1 kB     00:00
updates                                                  | 1.9 kB     00:00
Excluding Packages in global exclude list
Finished
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-pear.noarch 1:1.4.9-6.el5 set to be updated
--> Processing Dependency: php-devel for package: php-pear
--> Running transaction check
---> Package php-devel.x86_64 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Dependency: php = 5.1.6-27.el5_5.3 for package: php-devel
--> Processing Dependency: autoconf for package: php-devel
--> Processing Dependency: automake for package: php-devel
--> Running transaction check
---> Package autoconf.noarch 0:2.59-12 set to be updated
--> Processing Dependency: imake for package: autoconf
---> Package automake.noarch 0:1.9.6-2.3.el5 set to be updated
---> Package php-devel.x86_64 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Dependency: php = 5.1.6-27.el5_5.3 for package: php-devel
--> Running transaction check
---> Package imake.x86_64 0:1.0.2-3 set to be updated
---> Package php-devel.x86_64 0:5.1.6-27.el5_5.3 set to be updated
--> Processing Dependency: php = 5.1.6-27.el5_5.3 for package: php-devel
--> Finished Dependency Resolution
php-devel-5.1.6-27.el5_5.3.x86_64 from base has depsolving problems
  --> Missing Dependency: php = 5.1.6-27.el5_5.3 is needed by package php-devel-5.1.6-27.el5_5.3.x86_64 (base)
Error: Missing Dependency: php = 5.1.6-27.el5_5.3 is needed by package php-devel-5.1.6-27.el5_5.3.x86_64 (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.

Кто-нибудь, что означают эти две ошибки и как мне их исправить?

php-devel-5.1.6-27.el5_5.3.x86_64 from base has depsolving problems
  --> Missing Dependency: php = 5.1.6-27.el5_5.3 is needed by package php-devel-5.1.6-27.el5_5.3.x86_64 (base)
Error: Missing Dependency: php = 5.1.6-27.el5_5.3 is needed by package php-devel-5.1.6-27.el5_5.3.x86_64 (base)

Думаю, именно по этой причине я не могу установить apc на свой сервер. Сервер работает под управлением centos 5.6 с php 5.3.8. Панель управления - plesk 10.