How to create a directory in multiple packages?

["Peter Kjellerstedt" <peter.kjellerstedt@axis.com>]

Say we have a recipe that creates an empty /etc/foo directory. Now we 
want to add a new file in that directory /etc/foo/bar and package it as 
${PN}-bar. This means the creation of the /etc/foo directory is moved 
from the ${PN} package to the ${PN}-bar package. Is there any way to 
make ${PN} continue to create an empty /etc/foo, or is the only 
alternative to introduce an /etc/foo/.dummy and package it in ${PN}?

//Peter