[MacPorts] #47477: ROOT6 : Fix for Xcode 6.3

[MacPorts]

#47477: ROOT6 : Fix for Xcode 6.3
---------------------------------+--------------------------------
 Reporter:  jonesc@…             |      Owner:  macports-tickets@…
     Type:  update               |     Status:  new
 Priority:  Normal               |  Milestone:
Component:  ports                |    Version:  2.3.3
 Keywords:  haspatch maintainer  |       Port:  root6
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 Hi,

 Fixes the issue ROOT6 has with Xcode 6, but updating to a git tag that
 includes an upstream fix.

 To indicate this update is somewhere between 6.03.02 and any future
 upstream update, I have named it 6.03.02.91.

 Also adds support for clang 3.6 as a compiler option.

 Chris

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Ticket URL: <https://trac.macports.org/ticket/47477>
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