An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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besu/docs/Installation/Build-From-Source.md

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description: Building Pantheon from source code
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# Build from Source
## Prerequisites
* [Java JDK](http://www.oracle.com/technetwork/java/javase/downloads/index.html)
!!!important
Pantheon requires Java 8+ to compile; earlier versions are not supported.
* [Git](https://git-scm.com/downloads) or [GitHub Desktop](https://desktop.github.com/)
## Running Locally
* [Installation on Linux / Unix / Mac OS X](#installation-on-linux-unix-mac-os-x)
* [Installation on Windows](#installation-on-windows)
## Running On Virtual Machine
* [Installation on VM](#installation-on-vm)
## Installation on Linux / Unix / Mac OS X
###Clone the Pantheon Repository
Clone the **PegaSysEng/pantheon** repo to your home directory (`/home/<user>`):
```bash
git clone --recursive https://github.com/PegaSysEng/pantheon.git
```
### Build Pantheon
After cloning, go to the `pantheon` directory.
Build Pantheon with the Gradle wrapper `gradlew`, omitting tests as follows:
```bash
./gradlew build -x test
```
Go to the distribution directory:
```bash
cd build/distributions/
```
Expand the distribution archive:
```bash
tar -xzf pantheon-<version>.tar.gz
```
Move to the expanded folder and display the Pantheon help to confirm installation.
````bash
cd pantheon-<version>/
bin/pantheon --help
````
!!! note "Linux Open File Limit"
If synchronizing to MainNet on Linux or other chains with large data requirements, increase the maximum number
of open files allowed using `ulimit`. If the open files limit is not high enough, a `Too many open files` RocksDB exception occurs.
Continue with [Starting Pantheon](../Getting-Started/Starting-Pantheon.md).
## Installation on Windows
!!!note
Pantheon is currently supported only on 64-bit versions of Windows, and requires a 64-bit version of JDK/JRE.
We recommend that you also remove any 32-bit JDK/JRE installations.
### Install Pantheon
In Git bash, go to your working directory for repositories. Clone the `PegaSysEng/pantheon` repo into this directory:
```bat
git clone --recursive https://github.com/PegaSysEng/pantheon
```
### Build Pantheon
Go to the `pantheon` directory:
```bat
cd pantheon
```
Open a Windows command prompt. Build Pantheon with the Gradle wrapper `gradlew`, omitting tests as follows:
```bat
.\gradlew build -x test
```
!!!note
To run `gradlew`, you must have the **JAVA_HOME** system variable set to the Java installation directory.
For example: `JAVA_HOME = C:\Program Files\Java\jdk1.8.0_181`.
Go to the distribution directory:
```bat
cd build\distributions
```
Expand the distribution archive:
```bat
tar -xzf pantheon-<version>.tar.gz
```
Move to the expanded folder and display the Pantheon help to confirm installation.
```bat
cd pantheon-<version>
bin\pantheon --help
```
Continue with [Starting Pantheon](../Getting-Started/Starting-Pantheon.md).
## Installation on VM
You can run Pantheon on a virtual machine (VM) on a cloud service such as AWS or Azure, or locally using a VM manager such as [VirtualBox](https://www.virtualbox.org/).
If you set up your own VM locally using a VM manager such as [VirtualBox](https://www.virtualbox.org/), there are a few considerations:
* Make sure that Intel Virtualization Technology (VTx) and Virtualization Technology for Directed I/O (VT-d) are enabled in BIOS settings.
* On Windows, you might need to disable Hyper-V in the Windows Feature list.
It is recommended that you create a VM with the following attributes:
* Memory Size: Set to 4096 (recommended)
* Create a virtual hard disk with at least 10 GB; 20 GB is recommended
* Virtual hard disk file type: VDI (if you need to share it with other apps, use VHD)
* (Optional) You can create a shared directory in order to copy block files or genesis files from the host computer to the VM. For details on how to create a shared directory, see "Share Folders" in [Install Ubuntu on Oracle VirtualBox](https://linus.nci.nih.gov/bdge/installUbuntu.html).