Install xdebug for php 5.3.17 on centos 6.3 (final)
The EPEL and REMI repo contains xdebug for php. I suggest you try them instead.
Their package name is: php-pecl-xdebug, so you can just go with yum install php-pecl-xdebug
Also, for further reference on xdebug availability: http://pkgs.org/download/php-pecl-xdebug
pecl install xdebug
http://xdebug.org/docs/install
As of Xdebug 0.9.0 you can install Xdebug through PEAR/PECL. This only works with with PEAR version 0.9.1-dev or higher and some UNIX.