Many GNU projects use a rule that will fail 'make distcheck' when it sees an address in the sources [2].
[1] https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=bf31... [2] https://git.savannah.gnu.org/cgit/gnulib.git/commit/?id=086c...
Made a note to add an fsf-address check to check-all-the-things.