- postgresql-server-dev-12 postgresql-12-postgis-3 \
- postgresql-contrib postgresql-12-postgis-3-scripts \
- php php-pgsql php-intl \
- python3-psycopg2 git
+ postgresql-12-postgis-3 \
+ postgresql-contrib-12 postgresql-12-postgis-3-scripts \
+ php php-pgsql php-intl libicu-dev python3-dotenv \
+ python3-psycopg2 python3-psutil python3-jinja2 \
+ python3-icu python3-datrie python3-yaml python3-pip git
+
+# Nominatim uses some typing features only available in later Python versions.
+# Install the latest version of the backport package:
+
+ pip3 install --user typing-extensions