[xml/sgml] Buildd failure for docbook2x

[Rafael Laboissiere]

Buildd of docbook2x on ia64 failed in a strange way.  From the buildd log
(see http://buildd.debian.org/build.php?&pkg=docbook2x):

=======================================================================
[...]
Making all in doc
make[2]: Entering directory `/build/buildd/docbook2x-0.8.2/doc'
../libxslt/db2x_xsltproc -C ../xslt/catalog.xml -I -s ./ss-texinfo.xsl -o docbook2X.txml docbook2X.xml
I/O error : Attempt to load network entity http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd
I/O error : Attempt to load network entity http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd
/usr/bin/perl -I../perl ../perl/db2x_texixml --utf8trans-program=../utf8trans/utf8trans --utf8trans-map=../charmaps/texi.charmap docbook2X.txml
make[2]: *** [docbook2X.texi] Broken pipe
make[2]: *** Deleting file `docbook2X.texi'
make[2]: Leaving directory `/build/buildd/docbook2x-0.8.2/doc'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/build/buildd/docbook2x-0.8.2'
make: *** [debian/stamp-makefile-build] Error 2
[...]
=======================================================================

Notice that the "I/O error" messages above also appear when the package
builds correctly on other architectures.

Any hints?

-- 
Rafael