id summary reporter owner description type status milestone component version severity resolution keywords cc 3724 and use same include guard pt@… Hartmut Kaiser and use the same include guard (i.e. SPIRIT_VERSION_NOVEMBER_13_2008_0834AM). As a result, the content of ends up being ignored when #included via resulting in SPIRIT_VERSION not being defined! Bugs closed Boost 1.42.0 spirit Boost 1.41.0 Problem fixed version.hpp include guard