As a rule, NixOS doesn't patch binaries, it causes RPATH to get baked in at build time. Also, as a rule, it doesn't have some sort of materialized FHS-like subt

As a rule, NixOS doesn't patch binaries, it causes RPATH to get baked in at build time. Also, as a rule, it doesn't have some sort of materialized FHS-like subtree for each package, it manages a complex filesystem tree where the (bit-exact) stuff from the packages is stored immutably by the hash of the full build description. Binary patching only comes in when they're trying to get closed source binaries to run on NixOS and is fully managed by the packaging process to happen the same way on every system. These days, though, the approach of using filesystem namespacing to give packages a custom FHS-like view of the world seems to be growing more common instead of the patching.