1. Android build
  - Download original android source code ( L 5.1 ) from http://source.android.com
  - Untar opensource packages of LGH410_Android_Lollipop_MR1_Android.tar.gz into downloaded android source directory
       a) tar -xvzf LGH410_Android_Lollipop_MR1_Android.tar.gz
  - And, 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 LGH410_Android_Lollipop_MR1_Kernel.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
    
    1) H410
        make ARCH=arm cf_global_com-perf_defconfig
        make ARCH=arm CROSS_COMPILE=../prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi- -j4
        
    * "-j4" : The number, 4, is the number of multiple jobs to be invoked simultaneously. 
  - After build, you can find the build image(Image.gz) at arch/arm/boot

3. how  to build chromium38_lge (vendor\lge\external\chromium38_lge\src),
   please refer to README.txt at the folder mentioned in the directory ( such as vendor\lge\external\chromium38_lge\src ).