# OAI O-RAN with E2 Installation

[TOC]

---

## Definition

## System Requirements

| System |Requirement |
|:--------:|:----: |
| OS | Ubuntu 20.04 LTS |
| Storage | >= 100 GB |
| RAM | >= 8 GB |
| CPU Core | >= 8 |
| Support Avx | `grep -o 'avx[^ ]*' /proc/cpuinfo` |


## Install Dependecies

sudo apt update && sudo apt upgrade -y
sudo apt-get install libmkl-dev libmkl-avx2
sudo apt install -y build-essential cmake ninja-build \
pkg-config libfftw3-dev libmbedtls-dev \
libboost-all-dev libgmp-dev libzmq3-dev \
libhiredis-dev libsctp-dev libcurl4-openssl-dev \
libgnutls28-dev libpcre3-dev libblas-dev \
liblapack-dev python3 python3-pip

# Install gcc & g++ 13
sudo apt install -y gcc-13 g++-13
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-10 100
sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-10 100
gcc --version
g++ --version

## Clone the Repository

We will use the [**2025w12**](https://gitlab.eurecom.fr/oai/openairinterface5g/-/tree/2025.w12) version of OAI.

git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git 
cd ~/openairinterface5g

git checkout 2025.w12

source oaienv

## Install OAI Dependencies

cd cmake_targets
sudo ./build_oai -I


## Build UEs and gNodeB Executables

**First**, change the yaml-cpp configuration:

sudo nano ~/openairinterface5g/common/config/yaml/CMakeLists.txt

Change the file:


find_package(yaml-cpp REQUIRED)
if (TARGET yaml-cpp)
   set_target_properties(yaml-cpp PROPERTIES IMPORTED_GLOBAL TRUE)
endif()
if (NOT TARGET yaml-cpp::yaml-cpp)
   add_library(yaml-cpp::yaml-cpp ALIAS yaml-cpp)
endif()

Then, **Build the gNB, nrUE, and E2 Interface**.

sudo ./build_oai -w SIMU --gNB --nrUE --build-e2 --ninja