project id's

From: brock_peabody (bpyama_at_[hidden])
Date: 2003-10-02 19:58:00

How do you import boost libraries so that:

exe exe_name : exe_name.cpp /boost/thread ;

or as seen in the manual:

exe app : app.cpp core utils /boost/filesystem//fs ;

Both give me the error: "error: Unable to resolve target-
id /boost/thread"?

I can get this to work as in the manual with "use-project" for my 
own projects. But I can't get:

use-project /thread : /boost/libs/thread/build ;

To work, it says there is no Jamfile in that directory (there is). 
Anyway, what's the correct way to depend on a boost library?

Thanks!