Error making docs for libinput

[Bill Spitzak]

On 01/24/2015 09:26 PM, Bill Spitzak wrote:
> Okay it seems to work with a modern version of graphviz. On Monday I
> will check what version I have that is not working (I am not at that
> machine now). Don't know if you want to go through the trouble of
> requiring a recent enough version.
>
> The working graphviz causes "dot -V" to return:
>
> dot - graphviz version 2.36.0 (20140111.2315)

Okay on the failing machine it is using:

doxygen 1.8.6
dot - graphviz version 2.26.3 (20100126.1600)

The result is that I get warnings and bad drawings for most of the dot 
graphics (attached is an example bad one). Some other drawings produce 
warnings but the resulting image look ok.

Furthermore for some reason a lot of the images do not appear in the 
documentation. The above is missing, and the graphs for showing the 
seats. However the drawings in the "Palm detection" and "scrolling" 
pages *do* appear. I think this is a doxygen problem, not dot.

I think the easiest fix may be to add a test for the version to 
configure. It looks like doxygen must be at least 1.8.8 and dot must be 
2.36.0.
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