To install rtl-sdr, run the following command in macOS terminal (Applications->Utilities->Terminal)
sudo port install rtl-sdr
To see what files were installed by rtl-sdr, run:
port contents rtl-sdr
To later upgrade rtl-sdr, run:
sudo port selfupdate && sudo port upgrade rtl-sdr
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.