error running tiptop with nixos: syscall: Operation not permitted

[karan bhatia]

i'm running nixos-based linux. when i load tiptop with nix-shell:

{ pkgs ? import <nixpkgs> {}}:

pkgs.mkShell {
  packages = [ pkgs.tiptop ];
  LD_LIBRARY_PATH = "${pkgs.stdenv.cc.cc.lib}/lib";
}

when run in the shell:

% tiptop
syscall: Operation not permitted
Could not perform syscall.
Don't know why...
%

any ideas?

. k