id summary reporter owner description type status milestone component version severity resolution keywords cc 12781 Boost.MPI header cannot be included in project headers ryan.krattiger@… Matthias Troyer "When including the Boost.MPI header inside of a project specific header file multiple definitions of macros from other supporting boost libraries. (output attached) There seems to be some header guards missing but I have not really looked in to the error beyond fixing it by not including the header outside of compiled project files. When using OS CentOS 6.5 this error does not exist so a newer OS is required to reproduce the error. I have reproduced the error on CentOS 7, Ubuntu 16.04.1-LTS, and Fedora 25. " Bugs new To Be Determined mpi Boost 1.61.0 Not Applicable