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

[Stephen J. Turnbull]

skip at pobox.com writes:
 > 
 >     Robert> Just out of interest, does the sed in /usr/xpg4 work correctly?
 > 
 > Yes, it does.  Thanks.  Adding a symlink to that version of sed from an
 > earlier directory in PATH solves my configure problem (but see my next
 > mail...).  I didn't want to insert /usr/xpg4/bin at the start of PATH for
 > fear of changing something else.
 > 
 > Just for completeness, /usr/ucb/sed does not work.

Thank you both very much for this analysis.

I suppose that the '?' construct is understood by basically all seds?
Using '\{0,1\}' instead of '?' seems like asking for trouble....

I'll check the autoconf portability docs and see what they say, but if
anyone has any random information on sed script portability I'd love
to hear it.