1. Android build
  - Download original android source code ( android-10.0.0_r40 ) from http://source.android.com
  ( $repo init -u https://android.googlesource.com/platform/manifest -b android-10.0.0_r40
    $repo sync -cdq -j12 --no-tags
    $repo start android-10.0.0_r40 --all
  )
	   
  - Then, merge the source into the android source code
  - Run following scripts to build android
    a) source build/envsetup.sh
    b) lunch 1                                        
    c) make -j4
	
	
  - When you compile the android source code, you have to add google original prebuilt source(toolchain) into the android directory.
  - After build, you can find output at out/target/product/generic

2. Kernel Build  
  - Uncompress using following command at the android directory

    a) tar -xvzf *_Kernel_Q.tar.gz

  - When you compile the kernel source code, you have to add google original "prebuilt" source(toolchain) into the android directory.
  - Run following scripts to build kernel
  
    a) cd kernel/msm-4.19 
    b) mkdir -p out 
    c) make ARCH=arm64 O=./out REAL_CC=../../../prebuilts/clang/host/linux-x86/clang-r353983c/bin/clang CLANG_TRIPLE=aarch64-linux-gnu- CROSS_COMPILE=../../../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android- DTC_EXT=../../../prebuilts/misc/linux-x86/dtc/dtc vendor/winglm-perf_defconfig 
    d) make ARCH=arm64 O=./out REAL_CC=../../../prebuilts/clang/host/linux-x86/clang-r353983c/bin/clang CLANG_TRIPLE=aarch64-linux-gnu- CROSS_COMPILE=../../../prebuilts/gcc/linux-x86/aarch64/aarch64-linux-android-4.9/bin/aarch64-linux-android- DTC_EXT=../../../prebuilts/misc/linux-x86/dtc/dtc -j4
 

	* "-j4" : The number, 4, is the number of multiple jobs to be invoked simultaneously.
    - After build, you can find the build image(Image) at kernel/msm-4.19/out/arch/arm64/boot and the dtb images at kernel/msm-4.19/out/arch/arm64/boot/dts/vendor/.
	
3. to obtain the open data about KnowMeABBA*.apk App  

 If you want to obtain the open data ( source ) for "KnowMeABBA*.apk" application, 
 the open data may be obtained at http://opensource.lge.com. 
 LGE will also provide open data ( code ) to you . 
 
 You can search the keyword with "KnowMeABBA" at the search window in http://opensource.lge.com.  

 You can find it in "Software List" at that website. 


 