--- build.xml.orig	2013-10-31 14:48:34.000000000 +0100
+++ build.xml	2014-06-09 08:19:22.000000000 +0200
@@ -221,10 +221,7 @@
 
   <target name="compile" depends="prepare,check_versions,driver">
 
-    <available classname="org.postgresql.Driver" property="old.driver.present" />
-    <fail message="Old driver was detected on classpath or in jre/lib/ext, please remove and try again." if="old.driver.present" />
-
-    <javac classpath="${srcdir}" srcdir="${srcdir}" destdir="${builddir}" debug="${debug}" source="${java.specification.version}">
+    <javac includeAntRuntime="no" classpath="${srcdir}" srcdir="${srcdir}" destdir="${builddir}" debug="${debug}">
       <patternset refid="jdbc.version.src.pattern"/>
     </javac>
   </target>