Hi,
The main Bison page at http://www.gnu.org/software/bison/ contains an
HTTPS link to the Bison Savannah repository that I think should be a
plain HTTP link:
<p>
Test versions of Bison can be found on
<a href="ftp://alpha.gnu.org/gnu/bison/">ftp://alpha.gnu.org/gnu/
bison/</a>
[via FTP]. The latest bleeding-edge version of the source code, along
with a revision history, can be found in the
<a href="https://savannah.gnu.org/projects/bison/">Bison
Savannah repository</a>.
Please note that we do not suggest using Bison sources from these
locations for production use.
Following the HTTPS link, my browser (Safari) complains about lack of
a certificate. If I use HTTP, I get the same page without the
certificate warning.
Happy holidays,
Carsten Clark