Seems to me that android has an android.support.v8 package that contains Renderscript support. The thing is, this doesn\'t seem documented anywhere - the support library doc
My Android tools contain the files:
./build-tools/18.1.0/renderscript/lib/renderscript-v8.jar ./build-tools/18.1.1/renderscript/lib/renderscript-v8.jar
Putting them in the libs/ directory of your project will result in a working build in Eclipse and with ant.