# $(PN).pdf to appear out-of-date, which leads to a recompilation of
# $(PN).tex... and so on. The order-only dependency means we won't
# rebuild $(PN).bbl if $(PN).aux changes.
# $(PN).pdf to appear out-of-date, which leads to a recompilation of
# $(PN).tex... and so on. The order-only dependency means we won't
# rebuild $(PN).bbl if $(PN).aux changes.