Can env vars be referenced in shibboleth2.xml?

[Peter Schober]

* Peter Schober <peter.schober at univie.ac.at> [2020-10-01 18:29]:
> * Cantor, Scott <cantor.2 at osu.edu> [2020-10-01 18:12]:
> > I assumed it was generic because otherwise that's...dumb. Either
> > Apache supports or it doesn't. I guess it doesn't.
> 
> This does sound a bit involved:
> https://httpd.apache.org/docs/2.4/env.html#using

Sorry, not the #using anchor, more the initial section explaining the
different uses of "environment variables".
-peter