Re: querying the version of libpq

And the dynamic linker will take any version of libpq.so that has the same major number, meaning that you
 cannot assume that it's not 8.4 just because you built against 9.0.

Not to mention when you're on windows (and I dunno if any other
platforms are like *that*), where they're all  libpq.dll and we'll
happily take *any* other libpq.dll (even an older one, but that will give you an error if you're actually using any functions not present in it).