$AUTOCONF
./configure 2>stderr || { cat stderr >&2; exit 1; }
cat stderr >&2
-test ! -s stderr
+# Ignore warning messages sometimes seen on Mac OS X; they are
+# not automake's fault anyway, but either autoconf's or Mac's.
+sed '/rm:.* conftest\.dSYM/d' stderr >stderr2
+test -s stderr2 && { cat stderr2; exit 1; }
: