My own project uses the boost build. In the root of my project tree I have a file boost-build.jam.
Which has always been:

     BOOST_BUILD ?= $(BOOST_ROOT)/tools/build/v2 ;

This no longer works. To get things to work I had to change to:

     BOOST_BUILD ?= $(BOOST_ROOT)/tools/build/src ;

This is a shame, since in the past I only had to change a environment variable BOOST_ROOT
to switch between different boost version !

>The standard procedure:
>
>       ./bootstrap.sh
>        ./b2 <options>
>
>works just the same. Why do you need to know the location of Boost.Build?
>
-> Volodya

Ta,
    Avi