buildbot exception in MacPorts on base-10.9_x86_64

[buildbot at macports.org]

The Buildbot has detected a build exception on builder base-10.9_x86_64 while building MacPorts. Full details are available at:
    https://build.macports.org/builders/base-10.9_x86_64/builds/100

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

Buildslave for this Build: base-10.9_x86_64

Build Reason: A build was forced by 'mk <mk at localhost>': force build
Build Source Stamp: HEAD
Blamelist: 

BUILD FAILED: exception interrupted

Sincerely,
 -The Buildbot