Can 'make ctags' create tags in top_builddir?

[Rhys Ulerich]

Hi all,

I noticed that the default 'make tags' target creates a toplevel TAGS
file that includes all the TAGS files in subdirectories.  This is
goodness.  At least on automake 1.10.1 it seems that a similar,
toplevel tags file is not created for the 'make ctags' target.  Is
this because ctags does not support an inclusion mechanism?  Could the
ctags -a argument (or some other mechanism) be used to simulate the
inclusion mechanism?

- Rhys