includeantruntime="false"

			
<target name="compile" depends="init">
   <javac includeantruntime="false" srcdir="${src}" destdir="${dest}"/>
</target>
			
			

or

			
<property name="build.sysclasspath" value="last"/>
			
			

将 executable="echo" 设置成 echo 是一种不错的调试手段

			
        <macrodef name="gulp">
                <attribute name="stage" default=""/>
                <attribute name="src" default=""/>
                <attribute name="dir" default="" />
                <sequential>
                        <exec vmlauncher="false" executable="echo" dir="@{dir}" osfamily="unix">
                                <arg line="--stage @{stage} --src @{src}"/>
                                <!-- arg value="stage @{stage}" / -->
                        </exec>
                </sequential>
        </macrodef>

        <target name="gulp">
                <gulp stage="${git.branch}" src="cn" dir="."/>
        </target>