Build Failure on ports-10.6_x86_64_legacy

[buildbot at macports.org]

Status:       Failure
Build slave:  ports-10.6_x86_64_legacy
Full logs:    https://build.macports.org/builders/ports-10.6_x86_64_legacy-watcher/builds/26706
Build reason: The SingleBranchScheduler scheduler named 'ports' triggered this build
Port list:    py-acme certbot certbot-apache certbot-nginx
Subport list:
	- py27-acme
	- certbot
	- certbot-apache
	- certbot-nginx
	- py-acme
	- py36-acme
	- py37-acme
Variants:     None
Revision:     3a3a79719f687963626e35e7c2a7fa4810ba84b4
Build time:   0:36:06
Author:       Marius Schamschula <mps at macports.org>

Log from failed builds:

Links to individual build jobs:
- ports-10.6_x86_64_legacy-builder #108717
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108717
- ports-10.6_x86_64_legacy-builder #108718
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108718
- ports-10.6_x86_64_legacy-builder #108719
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108719
- ports-10.6_x86_64_legacy-builder #108720
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108720
- ports-10.6_x86_64_legacy-builder #108721
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108721
- ports-10.6_x86_64_legacy-builder #108722
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108722
- ports-10.6_x86_64_legacy-builder #108723
  https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/108723

-- 
Best regards,
MacPorts Buildbot
https://build.macports.org/