[MacPorts] #57543: root6 build stage fails with Exit code: 2

[MacPorts]

#57543: root6 build stage fails with Exit code: 2
----------------------+--------------------
 Reporter:  jfcaron3  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.5.4
 Keywords:            |       Port:  root6
----------------------+--------------------
 I am trying to install root6 with a specific variant on OSX 10.11.6, and
 it consistently crashes in the build stage on a make command with an Exit
 code: 2

 The make command uses -j8 and in the past reducing the number of compile
 threads has helped.

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Ticket URL: <https://trac.macports.org/ticket/57543>
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