Where can I find build system option in Unity?

I'm building a VR application in unity version 2019.1.2f1 but I can't seem to find the "build system" option in build settings, has it been removed?

I've when into build settings and searched "build system" but still nothing.

Here is my unity screenshot. Myscreen

What I'm looking for screenshot. Build systems option

Solution

The internal build system is not in the latest version of Unity. The internal build system has been removed since 2019.1.0b1.

Android: Remove internal build system

Unity now only supports the Gradle build system for Android.