Hello, All! I'm trying to build project from folder which differs from BOOST_ROOT. But it gives me error:

H:\tmp\Boost\Tutorials\sample1>bjam --clean Jamfile:14: in load-aux rule project-root unknown in module Jamfile. C:/Echo/Boost/boost-build/build\project.jam:310: in load-jamfile C:/Echo/Boost/boost-build/build\project.jam:68: in project.load C:/Echo/Boost/boost-build\build-system.jam:80: in load C:\Echo\Boost\boost-build\kernel\modules.jam:259: in import C:\Echo\Boost\boost-build\kernel\bootstrap.jam:120: in boost-build C:\Echo\Boost\boost-build\boost-build.jam:1: in module scope

What is the root of the error and how can I fix it? Best Regards, Voronkov Konstantin