Index: src/main/org/apache/tools/ant/taskdefs/SubAnt.java
===================================================================
RCS file: /home/cvspublic/ant/src/main/org/apache/tools/ant/taskdefs/SubAnt.java,v
retrieving revision 1.9
diff -u -r1.9 SubAnt.java
--- src/main/org/apache/tools/ant/taskdefs/SubAnt.java	3 Sep 2003 10:03:47 -0000	1.9
+++ src/main/org/apache/tools/ant/taskdefs/SubAnt.java	24 Sep 2003 16:08:47 -0000
@@ -109,6 +109,7 @@
     private boolean inheritAll = false;
     private boolean inheritRefs = false;
     private boolean failOnError = true;
+    private boolean ignoreMissingBuildFile = false;
     private String output  = null;
 
     private Vector properties = new Vector();
@@ -200,6 +201,13 @@
      */
     private void execute(File file, File directory)
                 throws BuildException {
+
+        boolean fileFound = file.exists();
+
+        if(ignoreMissingBuildFile && !fileFound) {
+            return;
+        }
+
         if (!file.exists() || file.isDirectory() || !file.canRead()) {
             String msg = "Invalid file: " + file;
             if (failOnError) {
@@ -261,6 +269,16 @@
      */
     public void setFailonerror(boolean failOnError) {
         this.failOnError = failOnError;
+    }
+
+    /**
+     * Sets whether to continue or fail with a build exception if the build 
+     * file  is missing, false by default.
+     *
+     * @param  ignoreMissingBuildFile the new value for this boolean flag.
+     */
+    public void setIgnoreMissingBuildFile(boolean ignoreMissingBuildFile) {
+        this.ignoreMissingBuildFile = ignoreMissingBuildFile;
     }
 
     /**