[MCrossover97]

Hey there, hope you are doing fine

I was trying to add a library following this thread:
Adding Libraries to OpenFOAM

I tried to make the solver but then I got this error:

lnInclude/Reaktoro/Thermodynamics/Species/ThermoData.hpp:212:10: error: ‘optional’ in namespace ‘std’ does not name a template type
     std::optional<SpeciesThermoInterpolatedProperties> properties;

Then I searched and this solution came up. It says the reason is std:: optional is a part of C++17 standard; so you have to use std::experimental:: optional instead:
https://stackoverflow.com/questions/...e-or-directory

Unfortunately, this doesn't work either. can anyone help me with this?
Thank you so much!