If its installed thru easyapache then just run the following command to uninstall it.
/scripts/phpextensionmgr uninstall EAccelerator
Then download the latest version from eaccelerator.net and install it according to your needs.
download tar.gz file
tar xvzf eaccelerator-version.tar.gz
cd eaccelerator
export PHP_PREFIX="/usr"
/usr/local/bin/phpize
./configure --enable-eaccelerator=shared --with-php-config=$PHP_PREFIX/local/bin/php-config
make
make install