buildbot exception in MacPorts on ports-10.6_x86_64_legacy-builder

[buildbot at macports.org]

The Buildbot has detected a build exception on builder ports-10.6_x86_64_legacy-builder while building macports/macports-ports. Full details are available at:
    https://build.macports.org/builders/ports-10.6_x86_64_legacy-builder/builds/99284

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

Buildslave for this Build: ports-10.6_x86_64_legacy

Build Reason: The Triggerable scheduler named 'ports-10.6_x86_64_legacy-trigger' triggered this build
Build Source Stamp: [branch master] c6701d823f2ffca23b63383c0e8bdcfc809aaf77
Blamelist: Chris Jones <jonesc at macports.org>

BUILD FAILED: exception interrupted

Sincerely,
 -The Buildbot