diff -uprN webgraph-1.4.old/build.xml webgraph-1.4/build.xml
--- webgraph-1.4.old/build.xml	2004-11-25 22:09:18.924727128 +0100
+++ webgraph-1.4/build.xml	2004-11-25 22:31:37.224274672 +0100
@@ -15,6 +15,14 @@
   <property name="jal.apiurl"
     value="http://vigna.dsi.unimi.it/jal/docs/"/>
 
+  <path id="compile.classpath">
+	<pathelement location="lib/jal.jar" />
+	<pathelement location="lib/colt.jar" />
+	<pathelement location="lib/fastutil.jar" />
+	<pathelement location="lib/gnu.getopt.jar" />
+	<pathelement location="lib/mg4j.jar" />
+  </path>
+
   <target name="init">
     <mkdir dir="${build}"/>
   </target>
@@ -25,7 +33,10 @@
 	optimize="on"
         destdir="${build}"
 	source="1.4"
-    />
+	target="1.4">
+    
+	<classpath refid="compile.classpath" />
+</javac>
   </target>
 
   <target name="jar" depends="compile">
@@ -48,6 +59,7 @@
 	<link href="${fastutil.apiurl}"/>
 	<link href="${mg4j.apiurl}"/>
 	<link href="${colt.apiurl}"/>
+	<classpath refid="compile.classpath" />
     </javadoc>
   </target>