Quoting Glyn Astill <glynastill at yahoo.co.uk>:
>> That's working and committed to 2.0 + HEAD.
>>
>
> That's cool, just a note that I was upgrading to 1.2.17 when I got  
> this, not 2.0.x

Uh, oh...

That means I need to fix 1.2.17, presumably rolling 1.2.18.

And I need to think about that a little further; "DROP FUNCTION IF  
EXISTS" wasn't introduced until, I believe, PostgreSQL 8.2.  (It's not  
in 8.1.)

So that strategy won't work for 1.2 :-(.

Thanks for letting me know!