This looks like the Makefile update is missing for the Python 3.7 update under 6.7-stable.
Obtaining OpenBSD-6.7-stable ports tree. P devel/quirks/Makefile P devel/quirks/files/Quirks.pm U lang/python/3.7/distinfo P lang/python/3.7/pkg/PLIST-idle P lang/python/3.7/pkg/PLIST-main P lang/python/3.7/pkg/PLIST-tests Ian McWilliam