Compiling mongo-cxx-driver-r3.6.1

I am not sure why your posts are delayed in becoming visible. As far as the MNMLSTC project, it provides the c++17 polyfill. You can choose from other options (“Step 2” in the installation guide. For reference, the Debian and Ubuntu packages use the -DBSONCXX_POLY_USE_BOOST=1 option to avoid triggering the MNMLSTC download during the build.