Android : Changing EditText bottom line color with appcompat v7

I am using appcompat v7 to get the look consistent on Android 5 and less. It works rather well. However I cannot figure out how to change the bottom line color and the accent color for edittext only. Is it possible?

I have tried to use a custom android:editTextStyle but I only succeeded to change the full background color or text color but not the bottom line nor the accent color. Is there an attribute value to use?