filesystem is part of the c++17 standard

[KatieTheMathematician]

The cmakelists.txt file specifies c++17 but then includes stdc++fs in the target_link_libraries. Both simple.cpp and benchmark.cpp use std::experimental::filesystem. This fails to build with gcc 9.4.0 on Ubuntu. Removing stdc++fs from the target_link_libraries and using std::filesystem fixes the error.

[delaram-mz]

I had the same problem and this fix really helped me!