--- ./src/main/org/apache/tools/ant/util/JavaEnvUtils.java.sav	2006-05-31 18:18:10.000000000 -0400
+++ ./src/main/org/apache/tools/ant/util/JavaEnvUtils.java	2006-05-31 18:18:18.000000000 -0400
@@ -95,7 +95,7 @@
             Class.forName("java.lang.CharSequence");
             javaVersion = JAVA_1_4;
             javaVersionNumber++;
-            Class.forName("java.lang.Readable");
+            Class.forName("java.net.Proxy");
             javaVersion = JAVA_1_5;
             javaVersionNumber++;
         } catch (Throwable t) {
--- ./build.xml.sav	2006-05-31 18:18:28.000000000 -0400
+++ ./build.xml	2006-05-31 18:18:37.000000000 -0400
@@ -365,7 +365,7 @@
   <target name="check_for_optional_packages">
     <available property="jdk1.3+" classname="java.lang.StrictMath"/>
     <available property="jdk1.4+" classname="java.lang.CharSequence"/>
-    <available property="jdk1.5+" classname="java.lang.Readable"/>
+    <available property="jdk1.5+" classname="java.net.Proxy"/>
     <available property="kaffe" classname="kaffe.util.NotImplemented"/>
     <available property="bsf.present"
                classname="org.apache.bsf.BSFManager"