[boost] Problem with error_code.hpp dependency on winerror.h

I am wondering why does error_code.hpp include <winerror.h>? All it does is translate the error codes defined in <winerror.h> to a enum values defined in error_code.hpp; however this enum is windows-specific anyway and the user can't use it without <winerror.h>. So, why not leave it up to the user to include <winerror.h> if they care about those values to begin with? My problem is that I get a compile error under Windows, because I (indirectly) include error_code.hpp in my own cpp that is supposed to be platform-independent, and as such it does not see the platform SDK. Emil Dotchevski