I wrote:
> After thinking about this for awhile, it seems like the best solution
> is to make configure proceed like this:
> 1. Find libldap.
> 2. Detect whether it's OpenLDAP 2.5 or newer.
> 3. If not, try to find libldap_r.
Here's a proposed patch for that. It seems to do the right thing
with openldap 2.4.x and 2.6.x, but I don't have a 2.5 installation
at hand to try.
regards, tom lane