[MacPorts] #55297: gdb-7.12.1 fails to build under macOS 10.13.1

[MacPorts]

#55297: gdb-7.12.1 fails to build under macOS 10.13.1
---------------------+------------------------
 Reporter:  murrayE  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.4.2
 Keywords:  build    |       Port:  gdb-7.12.1
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 This is during a reinstall of ports during migration of MacPorts from
 macOS Sierra to High Sierra 10.13.1 (Installed new MacPorts; have to
 install ports manually since the script to do it automatically is not
 proceeding without an error.)

 Many warnings in build portion of log, but I don't see just what's causing
 the build failure.

 (Dependency boehmgc installed OK.)

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Ticket URL: <https://trac.macports.org/ticket/55297>
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