make web-doc fails

[David Bobroff]

I've just updated from CVS (ChangeLog 1.985) and built Lilypond 1.7.21. 
That was fine.  Doing 'make web-doc' resulted in an exit with an error. 
I've been getting an error on 'make web-doc' for some time now but
Han-Wen, I think, said that 'make web-doc' is sure to work for tarball
releases but not always for current CVS, so I haven't complained.  This
CVS updated is labelled "release commit" so I thought it was time to
speak up again.  The end of the console output follows.

-David Bobroff

type1/lilypond.map
make --no-builtin-rules out=www LILYPOND_BOOK_FORMAT=texi-html -C
input/regression/ WWW
make[1]: Entering directory `/home/lily-cvs/lilypond/input/regression'

[snip]

y voice-follower.ly volta-broken-left-edge.ly
lys-to-tely: writing ./out-www/collated-files.tely...
make[1]: *** No rule to make target
`/home/lily-cvs/lilypond/input/regression/abe.ly', needed by
`out-www/collated-files.texi'.  Stop.
make[1]: Leaving directory `/home/lily-cvs/lilypond/input/regression'
make: *** [web-doc] Error 2
address@hidden lilypond]#