buildbot failure in MacPorts on base-10.11_x86_64

[buildbot at macports.org]

The Buildbot has detected a new failure on builder base-10.11_x86_64 while building macports/macports-base. Full details are available at:
    https://build.macports.org/builders/base-10.11_x86_64/builds/643

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

Buildslave for this Build: base-10.11_x86_64

Build Reason: The SingleBranchScheduler scheduler named 'base' triggered this build
Build Source Stamp: [branch master] 8a7d6049444225b51d9a90a4cfe94a810f97551b
Blamelist: Joshua Root <jmr at macports.org>

BUILD FAILED: failed test

Sincerely,
 -The Buildbot