Android : Android Gradle picking up prebuilt .so Library for a specific flavor

My problem is picking up a specific prebuilt .so files from jniLibs or libs folder to be added in a specific productFlavors when packaging the APK.

I am using eclipse and command line to compile and assemble the codes.

Project Structure

/Projectroot
---/src
---/assets
---/res
---/jni
---/libs
---/flavor
----/flavor1
-------/jniLibs (prebuilt .so) 
----/flavor2

Here is my gradle script sample

build.gradle

productFlavors {
   productFlavor1 {
      jniLibs.srcDirs = ['flavor1/jniLibs']
   }
   productFlavor2 {
   }
}

buildTypes {
    debug {
    }
    release {
    }
}

So the final result would be each variants of APKs has different .so library dependecy.