Missing includes?

[dlandtaa]

Thanks for putting this together. I had to add these lines to the top of msgpack.hpp to get it to compile:

#include <system_error>
#include <unordered_map>

Am I missing something here?

[richardwei6]

For me its just #include <unordered_map>

Both are required for me too.

[BrentonPoke]

I also noticed this. Same exact problem.