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.