1. Android build
  - Download original android source code ( Lollipop 5.0.2_r1 ) from http://source.android.com
  - Untar opensource packages of LGV490_L_Android.tar.gz into downloaded android source directory
    a) tar -xvzf LGV490_L_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 14
    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
        tar xvzf LGV490_L_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
		b) export PATH=$PATH:tools/lz4demo
		c) make ARCH=arm CROSS_COMPILE=../prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin/arm-eabi- e8lte_defconfig zImage -j4
		* "-j4" : The number, 4, is the number of multiple jobs to be invoked simultaneously. 
		* lz4demo : More information can be found at "https://code.google.com/p/lz4/"
  - After build, you can find the build image(zImage) at arch/arm/boot/

3. how  to build chromium34_lge (vendor\lge\external\chromium34_lge\src),
   please refer to README.txt at the folder mentioned above.