Bug#558733:

[Johan Van de Wauw]

On Mon, Sep 5, 2011 at 1:04 PM, Francesco P. Lovergine
<frankie at debian.org> wrote:

> The in-development-forever status of 64bit TIFF library since ages
> makes me think that the issue will not be solved anytime soon.
>
> It is not a technical problem, I really do not understand why it
> is still consider not ready (and who is responsable of releasing indeed
> at this time).

After my own post, I started searching through the libtiff mailing
archive and came to the same conclusion: there are no regressions
which should stop us from using that version.
See eg:
http://www.asmail.be/msg0055077058.html (message from debian maintainer)

Johan