Source code is modified by CyanogenMod su, https://github.com/CyanogenMod/android_system_extras_su

Supports android 4.3+ devices and need to use su--daemon

Download the Android Native Development Kit (NDK): https://developer.android.com/ndk/downloads/index.html

Extract into some directory and put that in your path: export PATH=NDK_DIR:$PATH

In another directory clone this repo: git clone https://github.com/jpacg/su-binary

Change to the directory where the repo was cloned cd su-binary

To start build process use the following make or ndk-build NDK_PROJECT_PATH=. APP_BUILD_SCRIPT=./Android.mk NDK_APPLICATION_MK=./Application.mk

If all goes well you will get the compiled binary at: ./libs/armeabi-v7a/su