# wget http://pecl.php.net/get/yaml-1.1.1.tgz
# tar yaml-1.1.1.tgz
# cd yaml-1.1.1
# phpize
# ./configure
# make
# make install
=== make でエラーになる場合 ===
# yum install libyaml
===== extension用意 =====
echo 'extension=yaml.so' > /etc/php.d/yaml.ini
===== Apacheリロード =====
/etc/init.d/httpd configtest
/etc/init.d/httpd reload