Build Failure on ports-10.11_x86_64

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.11_x86_64
Full logs:    https://build.macports.org/builders/ports-10.11_x86_64-watcher/builds/17187
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    py-mdtraj
Subport list:
	- py37-mdtraj
Variants:     None
Revision:     b2ef251fcbea9ce11848562532af3148fcaa5562
Build time:   0:32:11
Author:       Giovanni Bussi <giovanni.bussi at gmail.com>

Log from failed builds:

Links to individual build jobs:
- ports-10.11_x86_64-builder #61649
  https://build.macports.org/builders/ports-10.11_x86_64-builder/builds/61649

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