<p>In <a href="https://github.com/geany/geany/pull/890#discussion_r52637603">doc/Makefile.am</a>:</p>
<pre style='color:#555'>> +Doxyfile.stamp: Doxyfile Doxyfile-gi $(doxygen_sources)
> +  $(AM_V_GEN)$(DOXYGEN) Doxyfile-gi && $(DOXYGEN) Doxyfile && echo "" > $@
> +
> +ALL_TARGETS = Doxyfile.stamp
> +
> +if WITH_PYTHON
> +
> +geany-scintilla-gtkdoc.h: geany-gtkdoc.h
> +
> +geany-gtkdoc.h: Doxyfile.stamp $(top_srcdir)/scripts/gen-api-gtkdoc.py
> +  $(AM_V_GEN)$(top_srcdir)/scripts/gen-api-gtkdoc.py xml -d $(builddir) \
> +  -o geany-gtkdoc.h --sci-output geany-scintilla-gtkdoc.h
> +
> +ALL_TARGETS += geany-gtkdoc.h geany-scintilla-gtkdoc.h
> +
> +geany_includedir = $(includedir)/geany/gtkdoc
</pre>
<p>I'd prefer the variable to be names e.g. <code>geany_gtkdocincludedir</code> or something, not to create confusing with the normal includedir in src</p>

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