Re: MacOS: xsltproc fails with "warning: failed to load external entity"

Hi hackers,

> Concretely, I'm thinking something like the attached.  Notes:

> > 1. I have not tested the meson changes.
> Works here.

Took me a while to figure out how to build the documentation with Meson:

```
XML_CATALOG_FILES=/usr/local/etc/xml/catalog ninja -C build alldocs
```

It works. Perhaps we should add:

```
ninja -C build alldocs
```

... command to installation.sgml file while on it, to the 17.4.1
Building and Installation with Meson / Short Version section.

> > 2. As this is written, you can't override the --nonet options very
> > easily in the Makefile build (you could do so at runtime by setting
> > XSLTPROC, but not at configure time); and you can't override them at
> > all in the meson build.  Given the lack of evidence that it's still
> > useful to allow net access, I'm untroubled by that.  I did intentionally
> > skip using "override" in the Makefile, though, to allow that case.
>
> I'm not troubled by this either.

Neither am I.

> 3. For consistency with the directions for other platforms, I made
> the package lists for macOS just mention libxslt.  That should
> be enough to pull in libxml2 as well.

Fair enough.

> 4. Use of --nonet changes the error message you get if xsltproc
> can't find the DTDs.  I copied the error I get from MacPorts'
> version of xsltproc, but can you confirm it's the same on Homebrew?

Yes, the message is the same.

-- 
Best regards,
Aleksander Alekseev