Build Failure on ports-10.13_x86_64

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.13_x86_64
Full logs:    https://build.macports.org/builders/ports-10.13_x86_64-watcher/builds/20875
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    libphonenumber-cpp
Subport list:
	- libphonenumber-cpp
Variants:     None
Revision:     53fc77c1f38aad56f781e4602df6cb148a273f14
Build time:   0:13:49
Author:       David B. Evans <devans at macports.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.13_x86_64-builder #72835
  https://build.macports.org/builders/ports-10.13_x86_64-builder/builds/72835

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MacPorts Buildbot
https://build.macports.org/