Compile environment to build

Ready to compile

Compiling Android requires high machine configuration:

64-bit CPU

16GB physical memory + swap memory

250GB of free disk space

The official recommendation is the Ubuntu 18.04 operating system.

The initialization of the compilation environment can refer to

http://source.android.com/source/initializing.html

 。

Ubuntu 14.04 package installation reference:

   sudo apt-get install git-core gnupg flex bison gperf build-essential zip curl \
   zlib1g-dev gcc-multilib g++-multilib libc6-dev-i386 lib32ncurses5-dev \
   x11proto-core-dev libx11-dev lib32z-dev ccache libgl1-mesa-dev libxml2-utils \
   xsltproc unzip python-pyelftools python3-pyelftools device-tree-compiler \
   libfdt-dev libfdt1 libssl-dev liblz4-tool python-dev

Ubuntu 16.04 and 18.04 package installation reference:

   sudo apt-get update

   sudo apt-get install git gnupg flex bison gperf libsdl1.2-dev \
   libesd-java libwxgtk3.0-dev squashfs-tools build-essential zip curl \
   libncurses5-dev zlib1g-dev pngcrush schedtool libxml2 libxml2-utils \
   xsltproc lzop libc6-dev schedtool g++-multilib lib32z1-dev lib32ncurses5-dev \
   lib32readline-dev gcc-multilib libswitch-perl libssl-dev unzip zip device-tree-compiler \
   liblz4-tool python-pyelftools python3-pyelftools -y 

Because everyone's PC system version and environment configuration are
different, the compilation after installing the software package is
not necessarily successful, and it is inevitable that there will be
some errors caused by the lack of some software packages, such as:

    OBJCOPY spl/u-boot-spl-nodtb.bin
     CAT     spl/u-boot-spl-dtb.bin
     COPY    spl/u-boot-spl.bin
     CFGCHK  u-boot.cfg
   ERROR: No 'dtc', please: apt-get install device-tree-compiler

Don't worry, we could install the lacking software package according
to the error message, just like you see:

   apt-get install device-tree-compiler