How do you back out MacOSX10.6.sdk

I originally installed MacOSX10.5.sdk when I bought my IMac years ago. I had since upgraded to Snow Leopard when it came out.

I recently compiled an application of my own using the older 10.5. It worked.

I later mucked around and installed Xcode 10.6. I recompiled my application and it crashes. The saved copy of my app still works.

Is there a way to back out MacOSX10.6.sdk? I don't have any more time trying to figure out what is wrong.

Nothing like answering your own post. Apple wanted me to re-install the OS. Hmph, reminds me of Windows.

Found this in the SDK notes:
sudo <Xcode>/Library/uninstall-devtools --mode=all
They then suggest rebooting and re-installing. I'm in the process of the latter.