Makefile.am create empty directory

Using autotools, I need to create an empty directory tree when typing make install, like:

/etc/myprg/
|-- foo

right now, I do this by specifying empty targets, like this:

myprgdir = $(sysconfdir)/myprg/
myprgfoodir = $(sysconfdir)/myprg/foo

and then

dist_myprg_DATA = 
dist_myprgfoo_DATA = 

But, I wonder if a better way to do something like this exists!