To install libSDL2pp, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install libSDL2pp
To see what files were installed by libSDL2pp, run:
port contents libSDL2pp
To later upgrade libSDL2pp, run:
sudo port selfupdate && sudo port upgrade libSDL2pp
Reporting an issue on MacPorts Trac
The MacPorts Project uses a system called Trac to file tickets to report bugs and enhancement requests.
Though anyone may search Trac for tickets, you must have a GitHub account in order to login to Trac to create tickets.