--with-error-checking=none doesn't work

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    Stephen> Maybe we managed to give you an old, broken configure.  Do you
    Stephen> have autoconf available?  If so could you try running autoconf,
    Stephen> and rerunning the configure command?

    Stephen> What shell are you using?

    Stephen> Did this configure script come from CVS or tarballs?

That confused me me because it also worked fine out of the box on my Mac.
Rerunning autoconf (2.59) didn't help.  I'm using bash 3.00.16(1)-release on
Solaris, 2.05b.0(1)-release on my Mac.

Okay, I tracked it down to what I think is a misuse of GNU sed features in
the configure script.  On my Mac:

    % with_error_checking=none
    % echo $with_error_checking | sed -e 's/^[a-z]*\(,\(.*\)\)\{0,1\}$/\2/'

On the Solaris system at work:

    % with_error_checking=none
    % echo $with_error_checking | sed -e 's/^[a-z]*\(,\(.*\)\)\{0,1\}$/\2/'
    none

Maybe configure (or autoconf) is expecting too much from Sun's sed.  I don't
believe older versions of sed understand the {0,1} construct do they?  I
think that's a GNU sed invention.  If I replace that sed command with gsed
(our local install of GNU sed), it works.

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