Ant build ${renderscript.opt.level}问题解决方案

问题如下：

BUILD FAILED
D:adt-bundle-windows-x86_64-20131030sdk oolsantuild.xml:653: The following error occurred while executing this line:
D:adt-bundle-windows-x86_64-20131030sdk oolsantuild.xml:679: '${renderscript.opt.level}' is not a permitted value for com.android.ant.RenderScriptTask$OptLevel

解决方案：

在android工程的project.properties中加入 renderscript.opt.level=O0 即可。