Re: pkg/59864: fonts/harfbuzz: Documentation build fails due to missing docbook-xsl and XML catalog

Hi!

Well, it's hard to tell. The difference is at least in the Darwin
and pkgsrc versions. I've recently updated it to pkgsrc-2025Q4 and
did very fresh bootstrap, but the issue remains in the place.

IMHO it is not a local environment issue, but rather that the pkgsrc
xsltproc binary does not load the system XML catalog by default (should
it tho?).

The gtk-doc is correctly configured to use the pkgsrc binary:

$ grep xslt /opt/pkg/share/gtk-doc/python/gtkdoc/config_data.py
xsltproc = '/opt/pkg/bin/xsltproc'

When running that binary with verbose output, it shows it does not
load the catalog automatically:

$ echo "<doc/>" | /opt/pkg/bin/xsltproc -v - 2>&1 | grep catalog
(no output, error code 1)

Because xsltproc is blind to the local catalog, it attempts to fetch
the stylesheets from sourceforge.net <http://sourceforge.net/> and fails.

My proposed "fix" works because explicitly exporting XML_CATALOG_FILES
forces xsltproc to look in the right place, bypassing the network check.

Since gtk-doc relies on xsltproc, harfbuzz (and potentially other
packages using gtk-doc) should probably ensure XML_CATALOG_FILES is
set in the MAKE_ENV to prevent this network dependency. Or xsltproc
should be enforced to the default catalog at /opt/pkg/etc/xml/catalog.

--
Mishka