I've been using a fully colour-managed desktop with x11-wm/windowmaker, xiccd (compiled from source) and graphics/colord. My setup is based on this guide: Thread 51153.
In the last update to graphics/colord, the build was changed to support libcolordcompat. See: http://www.freshports.org/graphics/colord. Unfortunately, this breaks installation of profiles (setting the X Atom) using dispwin from graphics/argyllcms. I believe this is due to a bug in libcolordcompat. The error is exactly the same as the one in this bug report for colord: https://bugs.freedesktop.org/show_bug.cgi?id=98870.
Note that the bug report is for colord 1.3.4, and claims it works for 1.3.3. However, I think that 1.2.12, which is the port version, is also broken in the same way.
I was able to make it work again by manually editing the Makefile and pkg-plist for the port to not use libcolordcompat. This further confirms my suspicion above.
I posted this in case someone else has this problem, and also to suggest that libcolordcompat be made a port option, instead of hard-coding it in. I understand that we cannot do anything about the actual bug till it's fixed upstream, but making libcolordcompat optional will make it easier to work around it.
FreeBSD giskard 11.0-RELEASE-p2 FreeBSD 11.0-RELEASE-p2 #0: Mon Oct 24 06:55:27 UTC 2016 firstname.lastname@example.org:/usr/obj/usr/src/sys/GENERIC \
colord version: colord-1.2.12