Comment 3 for bug 663620

zcml can be read/included with globs, so an ephemeral file would work (if it is there, it is read; if not, no biggie, because it was to be found in a glob). That's the best idea I have with the info I have so far. example: <include files="package-includes/*-meta.zcml" /> (from site.zcml)

<includeOverrides file="test-*-meta.zcml" /> would be equivalent (or whatever glob pattern you want, wherever)

If we were going to use environment variables we could have...any old part of the system look at that environment variable. I'd do it outside of the zcml stuff if possible.