--- build.xml.orig	2020-09-02 22:05:12.000000000 +0200
+++ build.xml	2021-03-16 14:41:19.331235267 +0100
@@ -18,16 +18,20 @@
 	<property name="output" value="bin" />
 	<property name="jar_file" value="ecj.jar" />
 
+	<path id="build.path">
+		<pathelement path="${javaapi}"/>
+	</path>
 	<target name="build">
 		<delete file="${basedir}/${jar_file}" failonerror="no" />
 		<delete dir="${output}" failonerror="no" />
 		<mkdir dir="${output}" />
 
 		<javac srcdir="${basedir}" destdir="${output}"
+					encoding="utf-8"
 					debuglevel="lines,source"
 					source="1.8"
 					target="1.8">
-			<compilerarg line="-Xlint:none"/>
+			<compilerarg line="-Xlint:none" value="-Xbootclasspath/p:${toString:build.path}"/>
 		</javac>
 
 		<delete file="${basedir}/META-INF/MANIFEST.MF" failonerror="false"/>