Dumb Emacs lilypond-mode question

[Tim McNamara]

I've had lilypond-mode working in Emacs for a year now, using Carbon  
Emacs on Mac OS X 10.4.  Works great, kuds to whomever wrote the  
mode.  I just built the latest Emacs 23.1 to give it a try; it  
initially didn't work with Lilypond at all until I remembered I had  
to add the lilypond-mode .el files to site-lisp inside Emacs.app.   
So, did that and lilypond-mode is automatically loaded when I open  
a .ly file.  Yay.  Everything looks fine, syntax coloring works, etc.

However, I can't compile.  C-c C-l results in "Compilation exited  
abnormally with code 127" (paraphrasing from memory here; there's  
also a /bin/bash complaint too).  Interestingly C-c C-s launches the  
designated PDF viewer (Preview) just fine, if I open a .ly file that  
has already been compiled and has a rendered PDF already.

This is not a new issue, when I tried to set up Carbon Emacs about a  
year ago I had the same problem... but I can't remember the fix and  
hence that is the "dumb" part of my question. I haven't been able to  
track the fix down in the archives of the lilypond-user list, which  
is where I got the fix last year IIRC.  Can anybody point me in the  
right direction?

BTW, my copy of Carbon Emacs with lilypond-mode still works fine, so  
that's the easy workaround.  This also suggests to me that it is not  
a problem in my .emacs file since that is the same for both Emacsen.   
I have some vague recollection of editing a particular file, just not  
*which* file.