boostorg/graph_parallel — pull request #6 by michaelopitz (2014-08-07 23:27:27+00:00)
Title: Added a presumably missing include directive.

So, I tried to compile Boost on Windows 8 with `toolset=msvc-12.0` (Visual Studio 2013).
Building the graph_parallel libraries (`boost_graph_parallel-vc120-mt-1_57.dll` etc.) succeeded for me only with the proposed fix.