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Welcome to the curly wiki!
If you get a build error due to code signing being enabled:
In Xcode, go to "Targets > Curly > Summary", and uncheck the "Code Sign Application" checkbox.
OR, to build and code sign Curly yourself, run Keychain Access.app and navigate in its menu to:
Keychain Access > Certificate Assistant > Create a Certificate
Then create a certificate with these settings: