[plt-scheme] configuration failure on FreeBSD

On FreeBSD 6.0-RELEASE-p5 :

    ./configure --prefix=$HOME/local/stow/plt
    configure: WARNING: you should use --build, --host, --target
    checking for gcc... gcc
...
    checking for ranlib... ranlib
    checking for strip... strip
    ltconfig: you must specify a LTMAIN file
    Try `ltconfig --help' for more information.
    configure: error: libtool configure failed
    configure: error: /usr/local/bin/bash './configure' failed for foreign/gcc/libffi

    Compilation exited abnormally with code 1 at Mon Mar  6 20:58:54

The relevant config.logs are attached.
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-- 
We can say that the universe consists of a substance, and this
substance we will call "atoms," or else we will call it
"monads."  Democritus called it atoms.  Leibniz called it
monads.  Fortunately, the two men never met, or there would have
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