Re: CREATE EXTENSION: documenting prereqs

Josh Kupershmidt <schmiddy@gmail.com> writes:
> Well, obviously I need to go into ./contrib/hstore/ and run make &&
> make install (or install the appropriate -contrib package if I were
> using a packaged build of Postgres). I think it'd be nice to give
> users some hint about this prerequisite. Appendix F [1] discusses
> this, but there's currently no link from [2] to [1]. The way the
> CREATE EXTENSION page reads right now, I could forgive a new user
> thinking he shouldn't need to install any dependencies.

On reflection there are a couple other cross-references that would
be useful here, too.  I've committed a modified version of this.

> A complementary approach would be to add an errhint to the "could not
> open extension control file..." error suggesting that the user install
> the contrib package himself, though I'm not sure offhand about the
> wording, especially since a user might be trying to install
> who-knows-what extension.

Yeah, I'm not sure how to do anything useful in one-or-so-lines there.

            regards, tom lane