smlnj: Where is the Compiler.Profile structure?

Hi,

I have a sml program I need to profile. I use SML/NJ 110.65, and
browsed the www.smlnj.org site to see if I could find anything about
profiling. This is what I found:

http://www.smlnj.org/doc/Compiler/pages/profile.html

Sound simple enough, the problem is just that I can't find the
structure Compiler.Profile on my system:

- open Compiler.Profile;
[autoloading]
[autoloading done]
stdIn:1.1-1.22 Error: unbound structure: Profile in path
Compiler.Profile

So, consequently, it's a bit hard to get started:

- Compiler.Profile.setProfMode true;
stdIn:1.1-1.29 Error: unbound structure: Profile in path
Compiler.Profile.setProfMode

So where should I look for the missing structure?

Thanks,
Henrik