building lilypond on OSX

[james]

I don't pretend to be all that great at building software from source on OSX.
I've successfully built some software, but mostly I use pre-compiled binaries.
The recent discussions on the lilypond-info have gotten me interested in making
lilypond more complete to the point that, since I have some time, I would like
to try building the software  from source.

That being said, I'm following the steps at
http://lilypond.org/doc/v2.11/Documentation/topdocs/INSTALL.html#Building-LilyPond
and, although they're a little older,
http://code.google.com/p/lilypond/issues/detail?id=504&start=100#c20
Using macports, I've installed all of the dependencies, and I begain the process
of building lilypond. Unfortunately, I've come to an error, and I don't have the
ability to resolve it.
make errors with the following information:
out/lexer.cc:384: error: no 'int yyFlexLexer::yywrap()' member function declared
in class 'yyFlexLexer'

If it's too difficult/time consuming to explain what went wrong and how I could
resolve it, I'm not too worried, I've come across similar problems trying to
build software from source, and since I already have a working version of
lilypond, I'm not too worried about it, but I wanted to ask in case it's
something really easy like a flag I can add to my configure.

Thanks in advance