unbound 1.6.1 => '--with-libevent'-option ineffective!?

[Matthias Fischer <matthias.fischer@ipfire.org>]

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Hi,

Today there was a confirmation of my assumption, the 'configure' option
'--with-libevent-support' is NOT enough (unbound-users(a)unbound.net):

***SNIP***
>> >> When building unbound with --with-libevent support, the make
>> >> install phase should also call make unbound-event-install or else
>> >> unbound-event.h does not get installed and the header file for
>> >> using the unbound event functionality is not available.
> >
> > Hello,
> >
> > the same "missing unbound-event.h" happen when building getdns
>> >> (https://getdnsapi.net)
> > Thanks for the hint, Paul!

This install is triggered by the option --enable-event-api .  Just
enabling --with-libevent does not trigger the install by itself.

Best regards, Wouter
***SNAP***

The 'libevent' update on the '1.4.15-stable' has unfortunately not
built, there were heaps of errors.

Because 'unbound' detects an existing 'libevent2' installation
(Changelog, line 1609: Detect libevent2 install automatically by
configure.) I first concentrated on updating 'libevent2' to 2.1.8
because '2.0.22' from 2014-01-05 seemed rather old.

The detection worked, 'unbound' with '--with-libevent' and
'--enable-event-api' and 'libevent2 2.1.8' run both here in test.

Special feature:
'Kbd 1.12' complains because of a few 'rootfile'-changes, otherwise no
other conspicuousness. Operation is stable.

Best,
Matthias