After changing the quarterly branch from 2016Q4 to 2017Q1,
doing a bulk update with poudriere and running "pkg ugprade"
on my laptop, i3lock stopped working.
fk@t520 ~ $i3lock
/usr/local/lib/libxkbcommon-x11.so.0: version V_0.5.0 required by /usr/local/bin/i3lock not defined
Explicitly forcing an i3lock upgrade with "pkg upgrade -f i3lock"
solved the problem.
My impression is that x11/i3lock needs a PORTREVISION bump
or more precise LIB_DEPENDS.
Sorry I missed it at the time :(