PostGIS : already installed, but with scripts, not extension

[Not Sqrt]

Hi,

I originally installed PostGiS with :
psql -d template_postgis -f $POSTGIS_SQL_PATH/postgis.sql

and similar commands (http://postgis.net/docs/manual-2.5/postgis_installation.html#create_new_db).

So not the new method http://postgis.net/docs/manual-2.5/postgis_installation.html#create_new_db_extensions

Now, django always wants to run "CREATE EXTENSION IF NOT EXISTS postgis", which fails with:

PostGIS is already installed in schema 'public'

Other than commenting the code in django/contrib/gis/db/backends/postgis/base.py, is there something else to do ?

Thanks a lot !