nix-info can't find libstdc++.so.6

Question

I used nix for some stuff earlier and it worked. But now I keep getting this:

$ nix-shell -p nix-info --run "nix-info"
bash: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

If I nix-shell in some project it'll first install the stuff, but then when it's done installing it can't run things because of the libstdc++ missing.

Does nix not provide its own libstdc++?

Answer 1

I now remember I've seen and solved this before, but that time I must've forgotten to write my solution on StackOverflow. That won't happen again: unset LD_PRELOAD (I was setting it to libtcmalloc in bashrc).