How does one drop a template database from PostgreSQL?

Question

postgres=# DROP DATABASE template_postgis;
ERROR:  cannot drop a template database

http://www.postgresql.org/docs/9.1/static/manage-ag-templatedbs.html

Answer 1

postgres=# UPDATE pg_database SET datistemplate='false' WHERE datname='template_postgis';
UPDATE 1
postgres=# DROP DATABASE template_postgis;
DROP DATABASE
postgres=#