Using .info documentation in emacs

[Kevin Barry]

Hi all,

I have installed the lilypond-doc package on my system (Fedora), but
it didn't add anything to the main info directory. In the LilyPond
menu in emacs two of the info buttons work (Internals and Glossary)
and the other two (LilyPond and index search) both give errors. I
tried adding the directory including them to the emacs path with
(add-to-list 'Info-default-directory-list
"/usr/share/doc/lilypond-doc/share/info")
but it didn't make any difference (which isn't surprising since the
`dir' file is empty).

Before I start trying all kinds of hackery to make the manuals appear
in my directory or make them accessible through lilypond-mode, is
there a proper way to do it?

Best wishes,
Kevin