I was going to commit several updates including font-dejavu.  Happily,
with:

  guix refresh -l font-dejavu

I found that many things would be rebuilt (including some big ones like
abiword, libreoffice, gimp, gnome).  This happens because 'font-dejavu'
is an input of 'cups-filters' which is an input of 'cups' which is an
input for several things including 'gtk+'.

So my question is: should this update go to master?