[ghkbrew]

> Doesn't that mean you need all the app's library dependencies installed into your alternate libdirs that you bind mount over top the "real" libdirs? Not just the ones you want to override?

You can also create a temp directory with symlinks as a poor mans overlay fs. You bind mount the original dir in an out of the way location so you can link to it and bind the temp dir over the standard location.

I believe thats what Nix's bubblewrap based FHSenv was doing last I checked.