sudo newrelic-install install

We searched and searched and couldn't find any complete enough PHP
installs. You may well have PHP installed on your system but are lacking
either the command line version or the php-config program that should
accompany each PHP install. Sometimes, these require that you install
the "dev" package for PHP or the "cli" version. We need one or the
other.

Please visit http://newrelic.com/docs/php and review the
installation documentation for ways in which you can customize this
script to look for PHP in non-standard locations or to do a manual
install.