postgresql - How to add sfcgal to an already postgis enabled database

I have a postgres 9.1 database with postgis 2.1, and I recently needed to add sfcgal to it, so i rebuilt postgis 2.1, but I can't find out how to update the postgis extension in postgres without dropping all data. Is there a way to do that ?

ALTER EXTENSION postgis UPDATE;

returns a notice saying i'm already at version 2.1.0

Thanks for any tips

Answer

just run the sfcgal.sql file into your existing database. Unfortunately, cgal is not packaged as an extension (actually, for exactly the reason your case demonstrates: you can't have two extensions with the same version and different capabilities).