[conda] Override .condarc file location?

[Skip Montanaro]

At work I share the same (NFS-mounted) home directory on Linux and Windows.
I do virtually nothing with Windows other than read mail and use it as a
glorified X terminal.

I did want to install and run a small typing/mouse watcher. I installed a
locally cached Anaconda environment and just run it from the root
environment (yeah, bad practice, I suppose, but I can always delete it and
start over if necessary - it's not shared with anyone).

Installation worked fine, but update failed because there are some local
Linux-specific bits in my ~/.condarc file. I commented them out to get
update to succeed. Is there a cleaner way of separating my Windows and
Linux .condarc files? Maybe a CONDARC environment variable which specifies
its location? This:

https://conda.io/docs/user-guide/tasks/build-packages/environment-variables.html

seemed like the obvious place such an environment variable would be
described, but I saw nothing. Any pointers/suggestions appreciated...

Skip Montanaro