I thought about `dlopen`, but did not know how to fetch it libc platform-independently (`dlopen(argv[0])` is fine on OS X, but not on Linux). Now I see that th

I thought about `dlopen`, but did not know how to fetch it libc platform-independently (`dlopen(argv[0])` is fine on OS X, but not on Linux). Now I see that the first argument can be NULL, that approach is feasible.