+1. Prerequisite for build environment
+`````````````````````````````````````
+
+* Your host need to meet the requirements for Yocto, please refer to:
+
+ * `Compatible Linux Distribution`_
+ * `Supported Linux Distributions`_
+ * `Required Packages for the Build Host`_
+
+* The recommended and tested host is Ubuntu 16.04/18.04 and CentOS 7.
+
+ * To install the required packages for Ubuntu 16.04/18.04:
+
+.. _`Compatible Linux Distribution`: https://www.yoctoproject.org/docs/2.6.3/brief-yoctoprojectqs/brief-yoctoprojectqs.html#brief-compatible-distro
+.. _`Supported Linux Distributions`: https://www.yoctoproject.org/docs/2.6.3/ref-manual/ref-manual.html#detailed-supported-distros)
+.. _`Required Packages for the Build Host`: https://www.yoctoproject.org/docs/2.6.3/ref-manual/ref-manual.html#required-packages-for-the-build-host
+
+::
+
+ $ sudo apt-get install gawk wget git-core diffstat unzip texinfo gcc-multilib \
+ build-essential chrpath socat cpio python python3 python3-pip python3-pexpect \
+ xz-utils debianutils iputils-ping make xsltproc docbook-utils fop dblatex xmlto \
+ python-git
+
+ * To install the required packages for CentOS 7:
+
+::
+
+ $ sudo yum install -y epel-release
+ $ sudo yum makecache
+ $ sudo yum install gawk make wget tar bzip2 gzip python unzip perl patch \
+ diffutils diffstat git cpp gcc gcc-c++ glibc-devel texinfo chrpath socat \
+ perl-Data-Dumper perl-Text-ParseWords perl-Thread-Queue perl-Digest-SHA \
+ python34-pip xz which SDL-devel xterm
+
+
+2. Use wrapper script build_oran.sh to setup build env and build the image
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