make all fails on docs

[Graham Percival]

Current git, on the GDP server (Linux, building from scratch)

make distclean
./autogen.sh
make -C python
make all

...
make[2]: Entering directory
`/home/lilypond/lilypond/Documentation/user'
/home/lilypond/lilypond/stepmake/stepmake/texinfo-rules.make:29:
warning: overriding commands for target `out/.info-images-dir.dep'
/home/lilypond/lilypond/stepmake/stepmake/texinfo-rules.make:29:
warning: ignoring old commands for target
`out/.info-images-dir.dep'
LANG= makeinfo --enable-encoding -D 'version 2.11.43' -I./out
--output=out/lilypond.info out/lilypond.texi
/home/lilypond/lilypond/Documentation/user/out//notation.texi:25:
@include `pitches.texi': No such file or directory.
/home/lilypond/lilypond/Documentation/user/out//notation.texi:25:
@include `rhythms.texi': No such file or directory.
... similar messages for all the other files.


Compile fails here.

GUB isn't building on my personal OSX machine, but I won't
complain about that until the "compile from scratch" method is
working.  :)

Cheers,
- Graham