In order to download XCode, I have to create an Apple account, which involves giving Apple my phone number? No thanks.
Well, at least trying to run "cc" has prompted it to try to install the command-line developer tools, which is all I wanted anyways. I just hope that estimated 80-hour download time is wrong.
On the plus side, it's taken less than 40 hours for the progress bar to make it past the half-way mark. On the minus side, the progress bar hasn't moved for the last little while, and is no longer giving a time estimate.
Finally installed. Why is macOS so hard to use? I prefer being able to just "apt install gcc".