diff --git a/WHATSNEW b/WHATSNEW
index f62683ff8..d27ce1743 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -19,8 +19,10 @@ org.apache.tools.ant to org.apache.tools.ant.types.
 Other changes:
 --------------
 
-* New tasks: sql, junit, mparse, execon. All except sql pending
-documentation, most of them pending review.
+* New tasks: sql, genkey, cab.
+
+* New tasks junit, mparse, execon. All pending documentation, most of
+them pending review.
 
 * <java> uses ClassLoader of its own in no-fork mode if a classpath is
 specified.
@@ -55,3 +57,7 @@ respect to the Project's basedir.
 
 * Project didn't interpret the basedir attribute correctly in all
 cases.
+
+* Nested <src> in <javac> caused NullPointerException.
+
+* Corrupt Zip- and Jar-files ar now deleted if the task fails.
\ No newline at end of file
diff --git a/src/main/org/apache/tools/ant/taskdefs/Exec.java b/src/main/org/apache/tools/ant/taskdefs/Exec.java
index a07ed3906..fc39f2114 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Exec.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Exec.java
@@ -62,6 +62,9 @@ import java.io.*;
  *
  * @author duncan@x180.com
  * @author rubys@us.ibm.com
+ *
+ * @deprected Instead of using this class, please extend ExecTask or
+ * delegate to Execute.  
  */
 public class Exec extends Task {
     private String os;
diff --git a/src/main/org/apache/tools/ant/taskdefs/Execute.java b/src/main/org/apache/tools/ant/taskdefs/Execute.java
index 255e9b4f9..314d5c7a8 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Execute.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Execute.java
@@ -127,7 +127,8 @@ public class Execute {
         String[] commandLine = cmdl;
 
         if (workingDirectory != null && 
-            !antWorkingDirectory.equals(workingDirectory.getAbsolutePath())) {
+            !antWorkingDirectory.equals(workingDirectory.getAbsolutePath()) &&
+            !myos.equals("Mac OS")) {
 
             if (myos.toLowerCase().indexOf("windows") >= 0 &&
                 (myos.toLowerCase().indexOf("nt") >= 0 ||
@@ -200,6 +201,9 @@ public class Execute {
      * @param project the current project.
      */
     public void setAntRun(Project project) throws BuildException {
+    	if (myos.equals("Mac OS"))
+            return;
+
         String ant = project.getProperty("ant.home");
         if (ant == null) {
             throw new BuildException("Property 'ant.home' not found");
@@ -240,7 +244,19 @@ public class Execute {
 
 
     protected Process exec() throws IOException {
-        return Runtime.getRuntime().exec(getCommandline(), getEnvironment());
+        String userDir = System.getProperty("user.dir");
+        try {
+            if (myos.equals("Mac OS") && workingDirectory != null) {
+                System.getProperties().put("user.dir", 
+                                           workingDirectory.getAbsolutePath());
+            }
+
+            return Runtime.getRuntime().exec(getCommandline(), getEnvironment());
+        } finally {
+            if (myos.equals("Mac OS") && workingDirectory != null) {
+                System.getProperties().put("user.dir", userDir);
+            }
+        }
     }
 
     protected void waitFor(Process process) {