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Aleth – Ethereum C++ client, tools and libraries

The collection of C++ libraries and tools for Ethereum,
formerly known as cpp-ethereum project.
This includes the full Ethereum client aleth.


Getting Started

The Ethereum Documentation site hosts the cpp-ethereum homepage, which
has a Quick Start section.

Operating system Status
Ubuntu and macOS

Building from source

Get the source code

Git and GitHub are used to maintain the source code. Clone the repository by:

git clone --recursive
cd cpp-ethereum

The --recursive option is important. It orders git to clone additional
submodules to build the project.
If you missed --recursive option you can correct your mistake with command
git submodule update --init.

Install CMake

CMake is used to control the build configuration of the project. Quite recent
version of CMake is required
(at the time of writing 3.4.3 is the minimum).
We recommend installing CMake by downloading and unpacking the binary
distribution of the latest version available on the
CMake download page.

The CMake package available in your operating system can also be installed
and used if it meets the minimum version requirement.

Alternative method

The repository contains the
scripts/ script that downloads
a fixed version of CMake and unpacks it to the given directory prefix.
Example usage: scripts/ --prefix /usr/local.

Install dependencies (Linux, macOS)

The following libraries are required to be installed in the system in their
development variant:

  • leveldb

They usually can be installed using system-specific package manager.
Examples for some systems:

Operating system Installation command
Debian-based sudo apt-get install libleveldb-dev
RedHat-based dnf install leveldb-devel
macOS brew install leveldb

We also support a "one-button" shell script
which attempts to aggregate dependencies installation instructions for Unix-like
operating systems. It identifies your distro and installs the external packages.
Supporting the script is non-trivial task so please inform us
if it does not work for your use-case.

Install dependencies (Windows)

We provide prebuilt dependencies to build the project. Download them
with the scripts/install_deps.bat script.



Configure the project build with the following command to create the
build directory with the configuration.

mkdir build; cd build  # Create a build directory.
cmake ..               # Configure the project.
cmake --build .        # Build all default targets.

On Windows Visual Studio 2015 is required. You should generate Visual Studio
solution file (.sln) for 64-bit architecture by adding
-G "Visual Studio 14 2015 Win64" argument to the CMake configure command.
After configuration is completed, the aleth.sln can be found in the
build directory.

cmake .. -G "Visual Studio 14 2015 Win64"


The current codebase is the work of many, many hands, with over 100
individual contributors over the course of its development.

Our day-to-day development chat happens on the
cpp-ethereum Gitter channel.

All contributions are welcome! We try to keep a list of tasks that are suitable
for newcomers under the tag
help wanted.
If you have any questions, please just ask.

thoroughly before making alterations to the code base.

All development goes in develop branch.


This project is not suitable for Ethereum mining because the support for GPU mining
has been dropped some time ago including the ethminer tool. Use the ethminer tool from


To run the tests, make sure you clone and point the environment variable
ETHEREUM_TEST_PATH to that path.



All contributions are made under the GNU General Public License v3. See LICENSE.

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