no-x11 support broken for qbittorrent-nox11?

[Grzegorz Junka]

qbittorrent-nox11 doesn't compile because:

[01:24:43] ====>> [01][00:00:00] Starting build of 
graphics/gtk-update-icon-cache
[01:25:44] ====>> [01][00:01:01] Finished build of 
graphics/gtk-update-icon-cache: Failed: configure
[01:25:44] ====>> [01][00:01:01] Skipping build of 
net-p2p/qbittorrent-nox11: Dependent port graphics/gtk-update-icon-cache 
failed


In gtk-update-icon-cache logs I see:

===>  Configuring for gtk-update-icon-cache-2.24.29
gtk-update-icon-cache-2.24.29: Needs cairo with X11 support enabled.
*** Error code 1

Stop.
make: stopped in /usr/ports/graphics/gtk-update-icon-cache
====>> Cleaning up wrkdir
===>  Cleaning for gtk-update-icon-cache-2.24.29
build of graphics/gtk-update-icon-cache ended at Sat Oct 21 14:01:53 UTC 
2017
build time: 00:01:01
!!! build failure encountered !!!

So, why do I need to enable X11 in cairo when compiling nox11 version of 
qbittorent? There are no configurable options for gtk-update-icon-cache. 
Perhaps it's missing a nox11 option?

GrzegorzJ