They seem to all be around the fiber library, for example:

compile-c-c++ bin.v2\libs\fiber\build\msvc-8.0\release\address-model-64\link-static\threading-multi\algo\algorithm.obj
algorithm.cpp
.\boost/fiber/algo/algorithm.hpp(10) : fatal error C1083: Cannot open include file: 'chrono': No such file or directory