Hi, So I was building root from source with the following cmake options (setting it to build with the standard set to C++20) cmake -DCMAKE_CXX_STANDARD=20 -DCMAKE_INSTALL_PREFIX=/home/jade/bin/root .. I’ve attached the configuration results ( my-config.txt (14.2 KB))which didn’t have any errors.…

Remaining issues clarified at Root branch v6-30-00-patches for C++20 Not Quite Working - #6 by eguiraud .