Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Strange. I know we check for bison >= 1.875, and you have that, and so
> do I, but I don't see those regression failures. Is it possible you
> have old bison output files from an older bison release?
I think the check is only a warning though; and the only thing that
actually fails to build is ecpg's preproc.y. It's possible his current
copy of parser/gram.c was built with an older bison before he hit the
hard failure, and then he didn't go back and rebuild after updating
bison.
I'd suggest a "make maintainer-clean" and try again.
regards, tom lane