Fail to use self build Boost 1.75 under Ubuntu Linux 20.04 x64 with CMake default and 3.19.4

thanks for the tip with system layout, works for my example

FYI: layout=system is not compatible with my wanted --build-type=complet parameter but i can fix that by using different folder

i will ask on the boost mailing list how the boosts cmake stuff “should” help, will add mailing list post link here