check for os and xcode version

Helmut K. C. Tessarek tessarek at
Thu Oct 5 23:00:19 UTC 2017

I know I can check the OS release in portfiles with:

platform darwin X {

where X is the platform version.

It might be necessary to add fixes when OSX is Sierra/High Sierra AND
Xcode 9.

How can I do this in the portfile?

 K. C.

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   await thee at its end.

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