Conveniently, there is already a metapackage in IPS for installing a complete AMP stack in your OpenIndiana environment.
pfexec pkg install feature/amp
Best practice would be to install this inside of a local zone .
main problem: to v ery up to date
This unsupported community project is a free add-on to napp-it
It currently installs (please check http://napp-it.de/extensions/amp_en.html for newest add-on):
Other add-ons based on AMP like Owncloud are also available