MacOSX misrecognized as i386 by common/autoconf/build-aux/autoconf-config.guess?

[Mike Duigou]

With my most recent pull of jdk8/jdk8 I am seeing a surprising error on MacOSX Lion:

./configure:
configure: error: The tested number of bits in the target (64) differs from the number of bits expected to be found in the target (32)
configure exiting with result code 1

Which seems to be due to:

#bash common/autoconf/build-aux/autoconf-config.guess
i386-apple-darwin11.4.2

Anyone else seen this? Why did it suddenly appear?

Mike