Build Failure on ports-10.12_x86_64

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.12_x86_64
Full logs:    https://build.macports.org/builders/ports-10.12_x86_64-watcher/builds/14248
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    web-ext
Subport list:
	- web-ext
Variants:     None
Revision:     246b1714ab087a54de0842765aff449d3ac638f1
Build time:   0:13:15
Author:       Chih-Hsuan Yen <yan12125 at macports.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.12_x86_64-builder #60382
  https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/60382

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