Hi Folks,

When I attempt to create a database with PostGIS extensions, I get an
error "could not open extension control file":

  $ createdb -O ben testdb
  $ psql testdb --command="create extension postgis"
  ERROR:  could not open extension control file "/gnu/store/6238qjlc6cl7wld3gykcfj83ajlsrmjd-postgresql-10.5/share/extension/postgis.control": No such file or directory

My GuixSD system configuration includes the PostgreSQL service and the
PostGIS package, something like this:

  (packages (cons*
            ...
            postgis
            %base-packages))

  (services (cons*
            ...
            (postgresql-service)
            %desktop-services))

If I look in the store, I see "postgis.control" in a number of places,
but definitely not in the "postgresql-10.5" directory:

  $ find /gnu/store -name postgis.control
  /gnu/store/a9bnyqpxbhskf4vz6p84k4m42li4zqc8-postgis-2.4.4/share/extension/postgis.control
  /gnu/store/8jimyykpydhppbdbp72zr4z7l0z2fblr-profile/share/extension/postgis.control

Regards,
Ben