In Boost Library Guidelines, there aren't any specified character-sets. (are there?) Since some names of authors written in source files include high-ASCII characters that are incompatible with some other character-sets, they are unreadable for users setting non-ASCII character-sets as default like me (Japanese), and also compilers would generate warnings about it. Therefore, I think the guideline should specify character-set or limit available characters to low-ASCII only for source files to standardize way to read and process them. (To limit to low-ASCII is better for me.) The similar/same topics had been discussed, see links below: [boost] MSVC doesn't like some high-ASCII characters on non-US systems http://lists.boost.org/Archives/boost/2006/03/102561.php [boost] [Boost-bugs] [ boost-Bugs-1461533 ] Non-basic-source-character-set characters conflict with MSVC http://lists.boost.org/Archives/boost/2006/03/102596.php But now it seems stopped. No one interested anymore? Shintaro Sakahara