build.xml:391: javac doesn‘t support the “nativeheaderdir“ attribute

　　意思还是很明白的，javac不支持nativeheaderdir属性。

　　解决办法很简单，打开build.sh，去掉这个属性，继续编译。

<javac classpathref="compile.path"
           source="${compatibility}"
           target="${compatibility}"
           destdir="${classes}"
           includeantruntime="false"
           deprecation="on" 
           debug="${debug}"
           encoding="UTF-8"
           nativeheaderdir="${build.headers}">

改成

<javac classpathref="compile.path"
           source="${compatibility}"
           target="${compatibility}"
           destdir="${classes}"
           includeantruntime="false"
           deprecation="on" 
           debug="${debug}"
           encoding="UTF-8" >