Package: mgdiff Version: 1.0-9 Severity: serious mgdiff is still using the old /usr/X11R6/lib/X11/app-defaults directory. This directory is obsolete, and files in it are no longer used. Moreover, until everything is moved out of this directory to the new location, /etc/X11/app-defaults/, the maintainer of X cannot symlink the two directories in the way he would like to.
So, please rebuild your package and make it put app-defaults files in /etc/X11/app-defaults/. It if uses imake and you build it with a vaguely recent debian X package, this will happen automatically. This bug report was generated automatically, and was filed with the "serious" severity since using the old directory violates an accepted policy amendment.