Error installing Oracle Grid Infrastructure on Red Hat 8

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When trying to install Oracle Grid Infrastructure on Red Hat 8, I got the following error.

[WARNING] [INS-08101] Unexpected error while executing the action at state: ‘supportedOSCheck’. 

The fix is quite simple, but you have to “trick” the installer into telling you that you’re on an older version of the operating system.

Workaround

Export the environment variable CV_ASSUME_DISTID with the value OEL7.8.

export CV_ASSUME_DISTID=OEL7.8

Once this is done, start the installer again and the error should no longer appear.