<p>In <a href="https://github.com/geany/geany/pull/890#discussion_r52636026">doc/Makefile.am</a>:</p>
<pre style='color:#555'>>  
> -all-local: Doxyfile.stamp
> +Doxyfile.stamp: Doxyfile Doxyfile-gi $(doxygen_sources)
> +  $(AM_V_GEN)$(DOXYGEN) Doxyfile-gi && $(DOXYGEN) Doxyfile && echo "" > $@
> +
> +ALL_TARGETS = Doxyfile.stamp
</pre>
<p>why introducing this new variable?  AFAIK it's documented Make behavior to <em>add</em> dependencies when specifying a rule with only dependencies and no rules, so it would do the same as you do here… or am I missing some Automake weirdness?</p>

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