bison: it builds.

ERROR: 407 tests were run,
247 failed unexpectedly.
30 tests were skipped.

.. I checked the first failure and
it was down newline differences e.g.:

"Error: blah\r\n" not matching "Error: blah\n"

This needs to be fixed in Autotest (part of Autoconf),
something like this libtool patch:

https://www.mail-archive.com/libtool-patches@gnu.org/msg04437.html