WARNING !
#freebsd and #Xfce users : DO NOT upgrade pkg now, as the last pkg upgrade (to 2.1.0) introduces bugs and deletion of several ports, including XFCE dependencies. The repositories also don't have anymore the affected ports so you can't simply use pkg install.
The problem was identified and confirmed on the Freebsd forum by the team. No delay to fix AFAIK.
@xfce
edit 9 apr. : the problem looks to come from building failure of webkit2-gtk, which killed all pkg using it.