--- a/freeplane_plugin_script/ant/build.xml
+++ b/freeplane_plugin_script/ant/build.xml
@@ -18,7 +18,15 @@
 	<property name="classpath" value="${framework.jar}:${freeplane.jars}:${external.jars}:${jsyntaxpane.jar}" />
 	<property name="apidocdir" value="dist/doc/api" />
 
-	<target name="build" depends="build-ui-xml">
+  <target name="build-latex-lexer">
+    <exec executable="jflex">
+      <arg value="-d"/>
+      <arg value="src-jsyntaxpane/jsyntaxpane/lexers/"/>
+      <arg value="src-jsyntaxpane/jsyntaxpane/lexers/latex.flex"/>
+    </exec>
+  </target>
+
+	<target name="build" depends="build-ui-xml,build-latex-lexer">
 		<mkdir dir="build" />
 		<javac srcdir="src" destdir="build" classpath="${classpath}" debug="${debug}" source="${java_source_version}" target="${java_target_version}" encoding="utf8">
 			<exclude name="**/*Test.*" />
@@ -111,6 +119,7 @@
 		</delete>
 		<delete file="lib/jsyntaxpane/nodehighlighter.jar" quiet="true"/>
 		<delete file="${src.pluginclass}/preferences.xml" quiet="true"/>
+    <delete file="src-jsyntaxpane/jsyntaxpane/lexers/LaTeXLexer.java"/>
 	</target>
 
 </project>