> Could you paste the excerpt from that log that shows the command that
> produced libdevmapper-event-lvm2mirror.so?

--8<---------------cut here---------------start------------->8---
gcc -shared -Wl,-soname,libdevmapper-event-lvm2mirror.so.2.02 \
	-O2  -fPIC -L../../../../daemons/dmeventd/plugins/lvm2 -Wl,--version-script,.export.sym -Wl,-z,relro -L../../../../libdm -L../../../../lib -L../../../../libdaemon/client -L../../../../daemons/dmeventd dmeventd_mirror.o   -ldevmapper-event-lvm2 -ldevmapper -o libdevmapper-event-lvm2mirror.so.2.02
--8<---------------cut here---------------end--------------->8---

> It may be a matter of adding -ldevmapper to that command (which in turn
> will lead ld-wrapper to add the right -Wl,-rpath flag.)

`-ldevmapper` is in the command, so it does not seem like it's the
problem here.

Full build trace attached.

If I can't figure this out I'll send the incomplete patch.  I think
devmapper-event is the last missing piece of the udisks-update puzzle.

--
Pierre Neidhardt