build.xml

<?xml version="1.0"?>
<project name="Arduino IDE Core" default="build">

  <path id="class.path">
    <fileset dir="lib">
      <include name="*.jar"/>
    </fileset>
    <pathelement path="${env.JAVA_HOME}/lib/tools.jar"/>
  </path>

  <target name="clean" description="Clean out the build directories">
    <delete dir="bin" />
    <delete file="arduino-core.jar" />
  </target>

  <target name="compile" description="Compile">
<!--
    <taskdef name="methods"
             classname="PAppletMethods"
             classpath="methods/methods.jar" />
    <methods dir="${basedir}/src/processing/core" />
-->
    <mkdir dir="bin" />

    <!-- ant seems to nuke ${java.home} for some reason, pointing at the JRE
	 subfolder instead of the actual JDK found at JAVA_HOME. 
	 To avoid this, we grab the actual JAVA_HOME environment variable 
	 and use that to specify the location of tools.jar. -->

    <!-- if someone is better with ant please help clean this up -->
    <property environment="env" />
    <property name="java_home" value="${env.JAVA_HOME}" />

    <javac source="1.8"
           target="1.8"
           encoding="UTF-8"
           includeAntRuntime="false"
           srcdir="src"
           classpathref="class.path"
           debug="true"
           destdir="bin">
    </javac>

    <copy todir="bin" overwrite="true" verbose="true">
      <fileset dir="src" includes="**/*.properties" />
    </copy>
  </target>

  <target name="build" depends="compile" description="Build core library">
    <jar basedir="bin" destfile="arduino-core.jar" />
  </target>

</project>