Current OpenBSD issue...

To fix OpenBSD current build issues we need to resolve one of the older
TODO items:

TODO: Detect AIO support cleanly.

Requires some shuffling + rewrite of configure.in to get this sequence:

   - detect AIO header + libraries usability
   - for each component that depends on it...
     - if auto-enabled and AIO missing. auto-disable instead.
     - if force-enabled. error message on missing AIO
     - else enable, and set needs_aio
   - if needs_aio after all that
     - define the AIO include and libraries ac_define/ac_subst

Q: Is the --with-aio option still useful after that change?
A: Yes Gentoo will probably need it to pull libaio in for the build. But
it's a non-op for everyone else.

I want to get it done shortly, but have other stuff on the plate. If
anyone else has time please yell out and give it a go.

Amos

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