[postgis-users] Where is postGIS?

[Vince Miller]

For some reason, line feeds were missing in previous post:

Newby question: I want to attach postgis to my new db. 
Postgresql 9.1 seemed to install fine, but I can't find postgis.sql. 
Where is it? It's not in /usr/share/.../contrib as I'm given to expect. 
I don't want to compile from source to get it, if I don't have to. 
What's its relationship to postgis.sql.in.c?

BTW, I installed PG 9.1 as included in Ubuntu 9.1.

Thanks for your help.