Hi, BOOST_ERROR_CODE_HEADER_ONLY macro is useful, but undocumented. Should not use this macro? And I think should move implementation (`libs/system/src/error_code.cpp`) to `boost/system` if formal provide this macro(example: `boost/chrono/detail/inlined`). Depending on the package manager is not provide below the `libs` directory (example: Portage of Gentoo Linux). Thanks, Akira

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======================== Akira Takahashi mailto:faithandbrave@gmail.com blog: http://d.hatena.ne.jp/faith_and_brave/