buildbot failure in on serf-windows

[buildbot]

The Buildbot has detected a new failure on builder serf-windows while building 
. Full details are available at:
    https://ci.apache.org/builders/serf-windows/builds/495

Buildbot URL: https://ci.apache.org/

Buildslave for this Build: svn-w2k3-ra

Build Reason: The AnyBranchScheduler scheduler named 'on-serf-1.3.x-commit' 
triggered this build
Build Source Stamp: [branch serf/branches/1.3.x] 1750819
Blamelist: rhuijben

BUILD FAILED: failed

Sincerely,
 -The Buildbot