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 1.1
diff -u -r1.1 SubAnt.java
--- src/main/org/apache/tools/ant/taskdefs/SubAnt.java	14 Mar 2003 00:42:04 -0000	1.1
+++ src/main/org/apache/tools/ant/taskdefs/SubAnt.java	26 Mar 2003 20:04:28 -0000
@@ -94,6 +94,7 @@
     private boolean inheritAll = false;
     private boolean inheritRefs = false;
     private boolean failOnError = true;
+    private boolean ignoreMissingBuildFile = false;
 
     private Vector properties = new Vector();
     private Vector references = new Vector();
@@ -139,7 +140,14 @@
      */
     private void execute(File file)
                 throws BuildException {
-        if (!file.exists() || file.isDirectory() || !file.canRead()) {
+
+        boolean fileFound = file.exists();
+
+        if(ignoreMissingBuildFile && !fileFound) {
+            return;
+        }
+
+        if(!fileFound || file.isDirectory() || !file.canRead()) {
             String msg = "Invalid file: "+file;
             if (failOnError) {
                 throw new BuildException(msg);
@@ -186,6 +194,16 @@
      */
     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;
     }
 
     /**