Hi: When compiling the boost trunk, I get an error that the compiler can't cast 'const mapped_file_sink' to 'const mapped_file &' the line is 474 In libs\iostreams\src\mapped_file.cpp and reads: : mapped_file(static_cast<const mapped_file&>(other)) Anyone got any clue what is happening here? Chers Sean. __________ Information from ESET NOD32 Antivirus, version of virus signature database 3365 (20080818) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com