[boost] build error during integration of serialization lib

Dear Robert/experts, I am getting build errors after the integration of versioning in serialization lib. I have included the version.hpp. The following is the error msgs I am getting. Can someone please point me to the issue? FYI, everything is working fine except this versioning stuff. error: 'version' is not a template error: explicit specialization of non-template error: 'mpl' has not been declared error: ISO C++ forbids declaration of 'int_' with no type error: expected ';' before '<' token error: 'mpl' has not been declared error: 'integral_c_tag' does not name a type Thanks, Arunava.