[Boost-build] How can I set use-project globally?

From: Andrei Melnikov (andy.melnikov_at_[hidden])
Date: 2006-06-30 00:37:24

I can "use-project site-config/pkg : D:/Home/lib/pkg ;" in my Jamfile,
but not in site-config.jam

I want all my projects to know where to find /pkg project and its
subprojects. How can I add a project name to the scope globally?

Andrei