port diagnose on new catalina install says Xcode 12.1 not supported

[Ken Cunningham]

new install on a catalina system, then run port selfupdate, and then port diagnose:

% sudo port -v  diagnose    
Error: currently installed version of Xcode, 12.1, is not supported by MacPorts.  For your currently installed system, only the following versions of Xcode are supported:  11.6 11.5 11.4.1 11.4 11.3.1 11.3



Ken
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