This is my current workaround:

    # Overlays to fix package issues
    overlays = [
      # direnv 2.37.1 sets -linkmode=external but ships with CGO_ENABLED=0.
      # Enable cgo so the external linker flag works.  Remove once nixpkgs fixes it.
      (final: prev: {
        direnv = prev.direnv.overrideAttrs (old: {
          env = (old.env or {}) // {CGO_ENABLED = "1";};
        });
      })
    ];