[MacPorts] #67659: graphviz-gui: "Port graphviz-gui requires a full Xcode installation..."

[MacPorts]

#67659: graphviz-gui: "Port graphviz-gui requires a full Xcode installation..."
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 Reporter:  dyne2meter  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.8.1
 Keywords:              |       Port:
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 I'm using OSX 10.14; I have Xcode 10.3 installed, but I could install
 11.3.1 according to Apple

 In /Library/Developer/CommandLineTools/SDKs is 10.14.sdk

 I have no log to submit; all I get is the message indicated in my subject
 line

 Perhaps I should reinstall Xcode 10.3; please advise if you understand
 anything about this failure.

 Same thing happened for R-app, which I also have installed.

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Ticket URL: <https://trac.macports.org/ticket/67659>
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