Hello, 

I am trying to resolve this error: "5. Candidate function [with LoggerT = boost::log::v2s_mt_posix::sources::severity_logger_mt<boost::log::v2s_mt_posix::trivial::severity_level>] not viable: expects an l-value for 1st argument".

This error results in the inability to use the function "make_record_pump", in my .cxx file, because "make_record_pump" is not recognized as a function within "record_ostream.hpp" due to the previous error.  

I am attempting to compile this project on Xcode 10.2, after building the project with the newest version of CMake.  I have built boost (version 1.69.0) and installed the dynamic libraries with homebrew.

Thank you,
Austin Tapp