Magisk/core/build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 27

    externalNativeBuild {
        ndkBuild {
            path 'jni/Android.mk'
        }
    }

    defaultConfig {
        externalNativeBuild {
            ndkBuild {
                // Passes an optional argument to ndk-build.
                arguments "GRADLE=true"
            }
        }
    }
}