[MacPorts] #71798: make clean fails in vendor/install on macOS 10.11 (was: base @2.10.99 : configure does not create a Makefile in vendor/install on macOS 10.11)

[MacPorts]

#71798: make clean fails in vendor/install on macOS 10.11
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  Reporter:  snowflake  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  base       |    Version:  2.10.99
Resolution:             |   Keywords:
      Port:             |
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Comment (by jmroot):

 There isn't supposed to be a Makefile there on 10.11 because
 vendor/install isn't used at all.

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Ticket URL: <https://trac.macports.org/ticket/71798#comment:2>
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