[MacPorts] #56916: Failue upgrading ROOT6

[MacPorts]

#56916: Failue upgrading ROOT6
-----------------------+--------------------------
  Reporter:  angelog0  |      Owner:  cjones051073
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.5.3
Resolution:            |   Keywords:
      Port:  root6     |
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Comment (by cjones051073):

 In the end you should have cctools installed with the Xcode variant, as
 you are on macOS 10.13

 {{{
 Oberon ~/Downloads > port installed cctools
 The following ports are currently installed:
   cctools @895_5+xcode (active)

 Oberon ~/Downloads > /opt/local/bin/as --version
 Apple LLVM version 9.1.0 (clang-902.0.39.2)
 Target: x86_64-apple-darwin17.7.0
 Thread model: posix
 InstalledDir:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

 }}}

 Make sure you have the same, then try root again.

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Ticket URL: <https://trac.macports.org/ticket/56916#comment:13>
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