png: \
ladder_to_msc_test.png \
$(NULL)
%.png: %.msc
mscgen -T png -o $@ $<
%.msc: %.ladder
@which ladder_to_msc.py || (echo 'PLEASE POINT YOUR $$PATH AT libosmocore/contrib/ladder_to_msc.py' && false)
ladder_to_msc.py -i $< -o $@