[MacPorts] #57688: radare2 @3.1.0_0: fails to build if older version active (was: radare2 @3.1.0_0: fails to build on macOS 10.12 Xcode 9.2)

[MacPorts]

#57688: radare2 @3.1.0_0: fails to build if older version active
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  Reporter:  mopihopi  |      Owner:  g5pw
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  radare2   |
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Comment (by mopihopi):

 I was able to work around the error by cleaning and deactivating the old
 version first.

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Ticket URL: <https://trac.macports.org/ticket/57688#comment:6>
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