I understand that the next Linux release will have a major version of 5. This doesn't portend any technical changes. As has happened the last few times linux 5 should be no different than 4 which was no different than 3.
It looks to me like the postfix 3.4 makedefs still have: Linux.[34].*) SYSTYPE=LINUX$RELEASE_MAJOR Is it too late to add 5? Scott K