configuring include path

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2004-10-20 07:56:53

I would like that the user can specify the path (to the boost 
installation for instance) in his user-config.jam. The only way to 
propagate these 'usage-requirements' however from my user-config.jam to 
my project's Jamfile is using a dummy library:

<user-config.jam>
import project ;
project.initialize $(__name__) ;
project user-config
: usage-requirements
<include>/path/to/boost
;

lib boostheaders ;
</user-config.jam>

<in the Jamfile in the root-dir of my projects>
lib mylib_which_includes_boost_headers
: foo.cpp bar.cpp
/user-config//boostheaders
;
</Jamfile>

I'm sure there is a much more intelligent way ...