KrYounger
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and yes, after running (in a terminal)
**sudo mkdir /Library/Foo; sudo chown mylogin /Library/Foo **
and then setting the Derived Data folder in Xcode's Settings > Locations > Derived Data to /Library/Foo the app builds just fine for MacOs "Designed for iPad" (which is Catalyst, yes?) [This issue has bedeviled me for MONTHS, and happened way before 13-14-15 of Xcode]