From: John Gardner (huxoll_at_[hidden])
Date: 2006-02-14 15:30:48
Apparently the library is compiled treating wchar_t as a built-in
type. This applies to at least Visual Studio .Net 2003, and probably
2005.
Programs that link with the program_options lib need to define /Zc:wchar_t, e.g.
Project Properties -> C/C++ -> Language -> Treat wchar_t as Built-in Type -> Yes
--John Gardner