How to set AAPT flag in Eclipse?

Question

I use Eclipse to develop Android instead of Android Studio. (I have my reasons, I cannot use AS at the moment.)

Now I need to use VectorDrawableCompatat the moment. As mentioned in the section called “First things first” here , we must enable the AAPT flag to use VectorDrawableCompat. Now in the post , the mentioned method refers to Gradle (i.e. Android Studio):

android {
  defaultConfig {
    vectorDrawables.useSupportLibrary = true
  }
}

My question is how to set this AAPT flag in Eclipse?