buildbot failure in on fop-trunk

[buildbot]

The Buildbot has detected a new failure on builder fop-trunk while building . 
Full details are available at:
    https://ci.apache.org/builders/fop-trunk/builds/1820

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

Buildslave for this Build: asf947_ubuntu

Build Reason: The Nightly scheduler named 'fopNightly' triggered this build
Build Source Stamp: [branch xmlgraphics/fop/trunk] HEAD
Blamelist: 

BUILD FAILED: failed compile

Sincerely,
 -The Buildbot