You should run Xcode. It will ask you to install the additional components. If you don't see the dialog then it is probably already installed.
I run the xcode yesterday didn't get any errors. ( I also did xcode-select --install to manually install it ) I still get:
Sending data to remote compiler. Error
Error: security: SecKeychainDelete: The specified keychain could not be found.
builder verison 5.50
xcode: 10.1
mac: 10.14
on the compilation window, I see:
Adding user to keychain: merttufanvatandost
success: true, 50
****
errırÇ filenotfound exception. ...../provisoning Profies/bc001733-.......mobileprovision ( no such file or dir )