def bjam_build_cmd( self, *rest ):
        if sys.platform == 'win32':
            cmd = 'build.bat %s' % self.bjam_toolset
        else:
            cmd = './build.sh %s' % self.bjam_toolset
        env_setup_key = 'BJAM_ENVIRONMENT_SETUP'
        if os.environ.has_key( env_setup_key ):
            return '%s & %s' % ( os.environ[env_setup_key], cmd )
        return cmd