Texinfo / lilypond-book - include paths

[Michael Käppler]

Hi all,
I'm trying to integrate Lilypond snippets into Texinfo files.
Consider the 'Texinfo' example from the 'Usage' manual, which you can find
here:
http://lilypond.org/doc/v2.21/Documentation/usage/lilypond_002dbook-templates

With this example in lybook-texinfo.tely, I do

lilypond-book --output=out lybook-texinfo.tely
cd out
texi2pdf lybook-texinfo.texi

TeX complains that it does not find the image file
'./7a/lily-21179cd9-1' which is included in
out/7a/lily-21179cd9-systems.texi.

The file 'lily-21179cd9-1.eps' is there, indeed. How is this supposed to
work?
Do I have to specify manual includes somewhere?

Cheers,
Michael