automatically delete log files older than 10 days
diff --git a/releng.control/cc_config.xml b/releng.control/cc_config.xml
index f403a2e..9b43eca 100644
--- a/releng.control/cc_config.xml
+++ b/releng.control/cc_config.xml
@@ -48,7 +48,9 @@
         <dateformat format="yyyyMMdd-HHmm z" />
         <log
             dir="${logDir}"
-            encoding="ISO-8859-1" />
+            encoding="ISO-8859-1">
+            <delete every="10" unit="DAY" ignoreSuffix="true" />
+        </log>
         <listeners>
             <currentbuildstatuslistener />
         </listeners>