promote older systems support

[Ken Cunningham]

there is considerable grousing on the homebrew forums about their ruthless policy for dropping support for systems more or less right after apple does, and some of those forum posts about this topic have many thousands of views.

as you folks have put such effort into older systems support over the years, it might not be a waste of time to mention that support on the MacPorts main page <https://www.macports.org <https://www.macports.org/>>.

It is a primary differentiating feature.

Ken
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