Both the generated format specification document and the static
html documents depend on the logo in fish_xiph_org.png.
Unfortunately we can't list them both in their respective
dependencies because both are passed to doc_DATA for installation
and automake doesn't seem to remove duplicates, causing
/usr/bin/install to complain about the overwrite.
I couldn't find a good solution to this. Wrapping the doc_DATA
value in GNU make's $(sort /list/) function would work, but
automake warns about the non-portable construct. Instead, I've
just removed it from the spec dependency list and appended it
manually.
# bits needed by the spec
SPEC_PNG = \
components.png \
- fish_xiph_org.png \
floor1-1.png \
floor1-2.png \
floor1-3.png \
# explicit rules for generating docs
if BUILD_DOCS
-Vorbis_I_spec.html Vorbis_I_spec.css: $(SPEC_TEX) $(SPEC_PNG)
+Vorbis_I_spec.html Vorbis_I_spec.css: $(SPEC_TEX) $(SPEC_PNG) fish_xiph_org.png
htlatex $<
Vorbis_I_spec.pdf: $(SPEC_TEX) $(SPEC_PNG)