As always, the release managers would appreciate it if you download the candidate of your choice and give building it a try. Please report both success and failure, and anything else that is noteworthy.
Successfully built the libraries on ubuntu 18.04 with:
* gcc 7.5.0 for cxxstd=03,11,14,1z
* A fairly recent clang (built from source) for cxxstd=03,11,14,17,and 2a