Fixed #23873 -- Improved GIS error message when GEOS is not installed.

from django.core.exceptions import ImproperlyConfigured

# Want to get everything from the 'normal' models package.

from django.db.models import *  # NOQA

from django.contrib.gis.geos import HAS_GEOS

if not HAS_GEOS:

    raise ImproperlyConfigured(

        "GEOS is required and has not been detected. Are you sure it is installed? "

        "See also https://docs.djangoproject.com/en/stable/ref/contrib/gis/install/geolibs/")

# Geographic aggregate functions

from django.contrib.gis.db.models.aggregates import *  # NOQA