[ANN] Release 9.0.1

[panagiotis merakos]

Hello Alex,

Sorry, I thought I had replied already.

Yes, if you are on MacOS High Sierra you have to use either Xcode 9.4 or
9.4.1. Just make sure the command line tools (Xcode -> Preferences ->
Locations -> Command Line Tools) you use matches the Xcode version.

Best,
Panos
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