buildbot failure in on httpd-trunk

[buildbot]

The Buildbot has detected a new failure on builder httpd-trunk while building . 
Full details are available at:
    https://ci.apache.org/builders/httpd-trunk/builds/1669

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

Buildslave for this Build: bb_slave6_ubuntu

Build Reason: The AnyBranchScheduler scheduler named 'httpd-trunk-on-commit' 
triggered this build
Build Source Stamp: [branch httpd/httpd/trunk] 1822509
Blamelist: ylavic

BUILD FAILED: failed compile

Sincerely,
 -The Buildbot