buildbot failure in MacPorts on base-10.6_x86_64

[buildbot at macports.org]

The Buildbot has detected a new failure on builder base-10.6_x86_64 while building macports/macports-base. Full details are available at:
    https://build.macports.org/builders/base-10.6_x86_64/builds/528

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

Buildslave for this Build: base-10.6_x86_64

Build Reason: The SingleBranchScheduler scheduler named 'base' triggered this build
Build Source Stamp: [branch master] 9d07c481893bf9d0ebae05b31fa08186de2a0023
Blamelist: Andrew L. Moore <slewsys at gmail.com>

BUILD FAILED: failed

Sincerely,
 -The Buildbot