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 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.

Additionally, I have attached a series of screenshots to help portray this issue, and if there might be any more information I could provide, please let me know.  

Thank you,
Austin Tapp

Screen Shot 2019-04-15 at 2.58.20 PM.png

Screen Shot 2019-04-15 at 2.58.51 PM.png

Screen Shot 2019-04-15 at 2.58.37 PM.png