buildlink3 + pkg-config (libevent-related)

[Timo Buhrmester <fstd.lkml%gmail.com@localhost>]

I'm packaging a program that depends on devel/libevent, which comes
with three .pc files (libevent{,_openssl,_pthreads}.pc), all of
which end up in /usr/pkg/lib/pkgconfig as they should.

Now when I include libevent's buildlink3.mk and make wrapper,
only libevent.pc ends up being symlinked into the working
directory.

The configure stage of the program I'm packaging then runs
pkg-config [...] libevent_pthreads, which fails due to
libevent_pthreads.pc not being present.

I can manually symlink it there, between the 'wrapper' and the
'configure' stage, which causes the configure stage to succeed,
but obviously this isn't the way to go.

Is this a bug in the libevent package, or does my package need
to explicitly state that it wants all of libevent's .pc files?

(Additionally the non-pthreads libevent.pc gets appended to during
configuration (by the 'override-libevent-pkgconfig'-target in
devel/libevent/builtin.mk), corrupting the file in the process
so that another attempt to 'make configure' without cleaning up
inbetween fails to even detect that.)

Can somebody please shed light on this issue?