bjam and environment variables

From: Toon Knapen (toon.knapen_at_[hidden])
Date: 2004-10-11 03:26:19

At the end of chapter 2 of the documentation, it says that one needs to 
create a file boost-build.jam that contains:
boost-build /path/to/boost.build ;

It however does specify
1) if the path needs be absolute or can also be relative
2) if environment variables can be used at this point.

IMO the answer to these questions is:
1) both
2) yes

So this brings me to a broader question: are all env.vars. made 
available inside bjam? What if there is a clash between a local variable 
and a env.var?

So finally to conclude: would'nt it be a good idea to start a 
wiki-documentation project? This way unexperienced users (like my self) 
could help with the documentation as long as you can overlook everything 
to make sure the information is always correct.

toon