Hi all. Here are some compiler warnings received when building Boost 1.34.0 using Visual Studio .NET 7.1. libs\program_options\src\cmdline.cpp(294) : warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning) libs\program_options\src\cmdline.cpp(465) : warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning) D:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\xstring(151) : warning C4506: no definition for inline function 'size_t std:: char_traits<_Elem>::length(const _Elem *)' with [ _Elem=unsigned short ] Hope they help... Best regards, Jurko Gospodnetić