>>>>> "SY" == Steve Youngs <steve(a)youngs.au.com&gt; writes: SY> My autoconf doesn't do this, and I haven't heard of anyone SY> else's autoconf doing it either. Debian's has done this since about ac 2.53. I believe SuSE and Red Hat both do, as well. SY> And, just out of curiosity, what does this cygwin autoconf SY> wrapper do when faced with a configure.in that is for autoconf SY> 2.5x only? I've come across plenty of those. The Debian wrapper will puke, in a rather uninformative way if there's no AC_REQUIRE. Ben, please don't remove it. The right thing to do is to update XEmacs's configure.in to 2.5x compatibility. There's a patch in the queue from SuSE, has been for a long time (I've been hoping Didier would resurrect himself and review it ...).