I installed a newer version of Xfig, and to get proper color, I added "*customize -color" to my .Xdefaults file.
This is a very general option, which is good to have there for everyone. However, I have about 100 users on my system, so editing everyones .Xdefaults is a bit of work. (Sure, I already did it with "for" and echo >>", but nevertheless...)
So, I'm wondering if there is a global system-wide .Xdefaults where I can put this (and other) options, much like /etc/profile, where I can add e.g. a PATH to all users without modifying every single $HOME/.bash_profile.