Nix has profiles that makes it possible to symlink binaries from the /nix/store to the ~/.nix-profile/profile/bin so that it’s possible to keep that dir in PATH and run all your software.
Now, is there something similar that would symlink libraries from the nix store to the /usr/lib? I need it to ease the migration from the different package manager onto Nix. I would make it possible to packages each library one by one instead of having to rewrite all the packages into .nix at once.