bug#10988: stable-2.0 failed to build on a Mac

[Eric Hanchrow]

This is a MacBook Air running OS X 10.7.3.

I have macports (http://www.macports.org) installed.

Here's what I did:

    $ sudo port install libunistring pkgconfig boehmgc gmp
    $ git clone git://git.sv.gnu.org/guile.git
    $ cd guile/
    $ git checkout stable-2.0
    $ ./configure -C --with-libgmp-prefix=/opt/local
--with-libunistring-prefix=/opt/local
    $ make

After about 450 lines of output, it fails with
  GEN    guile-procedures.texi
guile: uncaught throw to unbound-variable: (#f Unbound variable: ~S (mod) #f)

I'd be happy to provide more details on request.  Thanks!