I've installed the PostgreSQL package (ver. 9.1) on a Debian 7 server using the command "apt-get install postgresql postgresql-contrib". I now want to install PostGIS as well. Should I install both the "postgis" package and the "postgresql-9.1-postgis" package or just the latter? It's not clear from the descriptions on their Debian wiki pages what the differences are between the two packages.
I ask because I've seen some blog posts where the author has installed both packages but yet on the OpenStreetMap PostGIS wiki page, they just install the postgresql-9.1-postgis package. Yet this Debian page seems to imply that you should install both packages as postgis contains common PostGIS files while postgresql-9.1-postgis contains files that specifically support PostgreSQL 9.1