diff --git a/WHATSNEW b/WHATSNEW
index ff72cbf72..6a6f302da 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -15,6 +15,10 @@ Changes that could break older environments:
    doesn't impact build scripts if their reference to junitlauncher task
    was merely through the use of the <junitlauncher> element.
 
+ * ClearCase#runS has been augmented by a two arg-version and the
+   one-arg version will no longer be called. This may affect
+   subclasses that have overridden runS.
+
 Fixed bugs:
 -----------
 
@@ -44,6 +48,9 @@ Fixed bugs:
    org.apache.tools.ant.Project#getCopyOfReferences.
    Github Pull Request #81
 
+ * cccheckout would ignore an error of the "ls checkout" command even
+   if failOnError was set to false.
+   Bugzilla Report 63071
 
 Other changes:
 --------------
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/CCCheckout.java b/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/CCCheckout.java
index a25109473..6ca7c676d 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/CCCheckout.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/CCCheckout.java
@@ -217,7 +217,7 @@ public class CCCheckout extends ClearCase {
         // viewpath
         cmdl.createArgument().setValue(getViewPath());
 
-        String result = runS(cmdl);
+        String result = runS(cmdl, getFailOnErr());
 
         return result != null && !result.isEmpty();
     }
diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/ClearCase.java b/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/ClearCase.java
index 5771a0dd6..98777bcdf 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/ClearCase.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/clearcase/ClearCase.java
@@ -33,9 +33,9 @@ import org.apache.tools.ant.util.FileUtils;
 /**
  * A base class for creating tasks for executing commands on ClearCase.
  * <p>
- * The class extends the 'exec' task as it operates by executing the cleartool program
- * supplied with ClearCase. By default the task expects the cleartool executable to be
- * in the path, * you can override this be specifying the cleartooldir attribute.
+ * By default the task expects the cleartool executable to be in the
+ * path, you can override this be specifying the cleartooldir
+ * attribute.
  * </p>
  * <p>
  * This class provides set and get methods for the 'viewpath' and 'objselect'
@@ -205,8 +205,21 @@ public abstract class ClearCase extends Task {
      * Execute the given command, and return it's output
      * @param cmdline command line to execute
      * @return output of the command line
+     * @deprecated use the two arg version instead
      */
+    @Deprecated
     protected String runS(Commandline cmdline) {
+        return runS(cmdline, false);
+    }
+
+    /**
+     * Execute the given command, and return it's output
+     * @param cmdline command line to execute
+     * @param failOnError whether to fail the build if the command fails
+     * @return output of the command line
+     * @since Ant 1.10.6
+     */
+    protected String runS(Commandline cmdline, boolean failOnError) {
         String   outV  = "opts.cc.runS.output" + pcnt++;
         ExecTask exe   = new ExecTask(this);
         Commandline.Argument arg = exe.createArg();
@@ -214,6 +227,7 @@ public abstract class ClearCase extends Task {
         exe.setExecutable(cmdline.getExecutable());
         arg.setLine(Commandline.toString(cmdline.getArguments()));
         exe.setOutputproperty(outV);
+        exe.setFailonerror(failOnError);
         exe.execute();
 
         return getProject().getProperty(outV);