There are packages for major platforms. You can install PGroonga easily.
There are separated documents for these platforms. And there is a document for building PGroonga from source.
Here are supported PostgreSQL versions:
If your PostgreSQL is older than them, you need to upgrade your PostgreSQL before you install PGroonga.
See a document for your platform in the followings:
trixie
bookworm
24.04
22.04
10
9
8
PostgreSQL 12
PostgreSQL 13
PostgreSQL 14
PostgreSQL 15
PostgreSQL 16
PostgreSQL 17
PostgreSQL 18
If you can't find your platform in the above list, build and install from source or send a request as an issue.