Starting from version 4.2.3 HylaFAX supports JBIG fax encoding (see http://www.hylafax.org/content/HylaFAX_4.2.3_release). Several people (like me) use to let HylaFAX convert incoming FAXes to PDF and send them by email to some address. The problem is that, unless you specify "Class1JBIGSupport: no" in /var/spool/fax/etc/config.ttyS0, you will randomly miss some incoming faxes! This happens when the sender supports JBIG and HylaFAX advertises JBIG support too, so the sender sends the fax in JBIG format but, once received, "HylaFAX + GhostScript + libtiff" are unable to convert the received TIFF in a PDF. So, until libtiff will be properly patched with JBIG support, I propose to show a big warn by the end of the HylaFAX emerging. Unfortunately it's not possible to put some note in the config files because they are dinamically generated by "faxsetup" program (unless to patch HylaFAX, of course). This bug is also referenced on HylaFAX bugzilla: http://bugs.hylafax.org//show_bug.cgi?id=730 Anyway I don't know if the proposed solution is already included in version 4.2.5 or it's still in CVS.
*** Bug 137615 has been marked as a duplicate of this bug. ***
Actually does exist a patch that could definitively solve this problem: http://bugzilla.remotesensing.org/show_bug.cgi?id=896 It looks like the patch is already in libtiff CVS, so until next libtiff is released, it should be sufficient to add it to the Gentoo tiff ebuild.
Version 4.3.0.5 checks during the configure phase to see if libtiff is properly patched: depending on the check it enables JBIG support for sending/receiving, sending only or completely disables it. On Gentoo it would result in a send only JBIG support. Of course it would be better to properly patch libtiff to obtain full send/receive JBIG support, meanwhile this Hylafax version update would prevent any unreadable incoming fax problem. Not sure if this configure libtiff check is included in stock Hylafax version 4.3.0, should be checked... anyway why not to bump to this more updated 4.3.0.5 version? See bug 133477.
The tiff patch from upstream CVS has been added, and Hylafax 4.3.0 as well. Give it a whirl...
