Can't compile C program on a Mac after upgrade to Mojave

Question

I have used the gcc command on the terminal to compile C programs but all of a sudden, after an update to my Mac\'s OS (to macOS 10.14 Mojave, and XCode 10.0), I started rec

Answer 1

Be sure to check Xcode Preferences -> Locations.

The Command Line Tools I had selected was for the previous version of Xcode (8.2.1 instead of 10.1)