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

I was having this issue and nothing worked. I ran xcode-select --install and also installed /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg.

BACKGROUND

Since I was having issues with App Store on a new laptop, I was forced to download the Xcode Beta installer from the Apple website to install Xcode outside App Store. So I only had Xcode Beta installed.

SOLUTION

This, (I think), was making clang to not find the SDKROOT directory /Applications/Xcode.app/...., because there is no Beta in the path, or maybe Xcode Beta simply doesn't install it (I don't know). To fix the issue, I had to remove Xcode Beta and resolve the App Store issue to install the release version.

tldr;

If you have Xcode Beta, try cleaning up everything and installing the release version before trying out the solutions that are working for other people.