I want to build an app in Android Studio with the support library but I get the following error when adding the dependency for the support library:
Error:Fai
If you are using Android Studio, then as an addition to changing the build.gradle file manually, you can also lookup the dependency via the library dependencies under the Project Structure menu item.

Double clicking that dependency will generate this line in build.gradle:
dependencies {
compile 'com.android.support:support-v13:+'
}
And also, if you are wondering what this library is about, it's described at the developer pages at developer.android.com; Support Library.