Ruby is not available on ia64.
Since graphviz tries to build the ruby plugin for all architectures,
the graphviz build fails on ia64.
Since most packages that use doxygen during the build also require
graphviz, many packages can't be built on ia64.
The dot binary doesn't need the ruby plugin, so a build without the
ruby plugin would make those packages buildable again.

The attached patch disables the ruby plugin on ia64.

	Mattias

We believe that the bug you reported is fixed in the latest version of
graphviz, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1012744@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Laszlo Boszormenyi (GCS) <gcs@debian.org> (supplier of updated graphviz package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Wed, 15 Jun 2022 19:55:30 +0200
Source: graphviz
Architecture: source
Version: 2.42.2-7
Distribution: unstable
Urgency: medium
Maintainer: Laszlo Boszormenyi (GCS) <gcs@debian.org>
Changed-By: Laszlo Boszormenyi (GCS) <gcs@debian.org>
Closes: 1003006 1012744
Changes:
 graphviz (2.42.2-7) unstable; urgency=medium
 .
   * Recommend fonts-liberation2 (closes: #1003006).
 .
   [ Mattias Ellert <mattias.ellert@physics.uu.se> ]
   * Drop ruby plugin on ia64 (closes: #1012744).
Checksums-Sha1:
 157080a95932131b468ff4e20b19eb3ad80ef9dc 3157 graphviz_2.42.2-7.dsc
 3b37db4798db774e13603abbf90591b6e743a665 38760 graphviz_2.42.2-7.debian.tar.xz
Checksums-Sha256:
 1500a93e6bc2da00008c27afd1d7092fed4d73830fc7055e3848aa1d7d77fec3 3157 graphviz_2.42.2-7.dsc
 281e5941f638d829e3a3ba7e9c5516f25eb1a0b643475b322dcb405a9acac35d 38760 graphviz_2.42.2-7.debian.tar.xz
Files:
 50615103851c63c56f9334086cae377b 3157 graphics optional graphviz_2.42.2-7.dsc
 3e9e87b2dfc50822150f899b3cdb7862 38760 graphics optional graphviz_2.42.2-7.debian.tar.xz
-----BEGIN PGP SIGNATURE-----
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=AG3P
-----END PGP SIGNATURE-----