third_party/flatbuffers/android/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
  ext.kotlin_version = "1.4.10"
  repositories {
    google()
    jcenter()
  }
  dependencies {
    classpath 'com.android.tools.build:gradle:4.1.0'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

    // NOTE: Do not place your application dependencies here; they belong
    // in the individual module build.gradle files
  }
}

allprojects {
  repositories {
    google()
    jcenter()
  }
}

tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
  sourceCompatibility = JavaVersion.VERSION_1_8
  targetCompatibility = JavaVersion.VERSION_1_8

  compileKotlin {
    dependsOn flatbuffer
  }
}

task clean(type: Delete) {
  delete rootProject.buildDir
}