[boost] boost cvs build failure: Unknown suffix

PYTHON_ROOT=/usr PYTHON_VERSION=2.4 bjam -sTOOLS=gcc stage Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (and if you don't know what ICU is then you probably don't need it). Unknown suffix on <@boost!libs!iostreams!build><<<<<<< - see UserObject rule in Jamfile(5).