Index: lams_gradebook/build.xml
===================================================================
diff -u -r7d494653a5670611d9aeb2ed36d867c90e8c0e99 -r1dec4cf4e40c2c969ff492e728ab5b9ce940a6c4
--- lams_gradebook/build.xml	(.../build.xml)	(revision 7d494653a5670611d9aeb2ed36d867c90e8c0e99)
+++ lams_gradebook/build.xml	(.../build.xml)	(revision 1dec4cf4e40c2c969ff492e728ab5b9ce940a6c4)
@@ -53,9 +53,13 @@
 		<mkdir dir="${build.lib}" />
 	</target>
 
-	<target name="clean" description="removes all class files">
-		<delete dir="${build}" quiet="false"/>
-		<mkdir dir="${build}"/>
+	<target name="clean" depends="preparedirs" description="removes all class files">
+		<delete>
+			<fileset dir="${build.classes.java}" />
+			<fileset dir="${build.classes.test}" />
+			<fileset dir="${build.lib}" />
+			<fileset dir="${build.war}" />
+		</delete>
 	</target>
 
 	<target name="compile.java" depends="clean" description="compile java sources">