I was getting the error:

[error] /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/universal-darwin20/rbconfig.rb:229: warning: Insecure world writable dir /Users/…/builds in PATH, mode 040777

Solution, for the specific path made the folder Read only for “everyone”, make sure you click on Apply to enclosed items…