That feeling you get when that right tool did all the work

The Amber CLI offers you a set of command line tools to create, generate, scaffold and run your projects quickly and simply.


Ensure you have the necessary dependencies:

  • Git: Use your platform specific package manager to install git

  • Crystal: Follow the instructions to get crystal on this page: Crystal Installation

  • NodeJS and Webpack: node is an optional dependency and is used to compile JavaScript and other assets.

  • PostgreSQL: postgres is a relational database server. Amber configures applications to use this database adapter by default, but you can switch to MySQL by passing the flag --database mysql when creating a new application.

Once you have these dependencies, You can build the amber tool from source:

From Source

Download and install amber

NOTE: At the time of this writing, v1.4.1 is the current stable release, but you should use the most recent tag in place of that.

sudo apt-get install libreadline-dev libsqlite3-dev libpq-dev libmysqlclient-dev libssl-dev libyaml-dev libpcre3-dev libevent-dev
git clone
cd amber
git checkout v1.4.1
shards install
sudo make install

If you run into an issue on compilation regarding Unhandled exception in spawn: fork: Cannot allocate memory it means you don't have enough memory. This can easily be solved by adding a swapfile.

sudo dd if=/dev/zero of=/swapfile bs=2k count=1024k
sudo mkswap /swapfile
sudo chmod 600 /swapfile
sudo swapon /swapfile

For Debian & Ubuntu

  • Currently, the only method to install on Debian based distros is to compile from source.

  • These are necessary to compile the CLI:

  • sudo apt-get install build-essential libreadline-dev libsqlite3-dev libpq-dev libmysqlclient-dev libssl-dev libyaml-dev

For RedHat & CentOS

  • sudo yum groupinstall development tools

  • sudo yum install readline-devel sqlite-devel openssl-devel libyaml-devel gc-devel libevent-devel

For ArchLinux & derivates

  • Install the CLI from AUR package. Dependencies are automatically installed.

  • yaourt -S amber

You should now be able to run amber in the command line.


Installing Amber with these package managers also installs Crystal.

  • Homebrew

    brew tap amberframework/amber
    brew install amber
  • MacPorts

    sudo port selfupdate
    sudo port install amber

From source

Known problems while trying to build Amber from source on macOS:

  • If you see linker problems, such as ld: library not found for -lssl (this usually means you need to install the development package for libssl), you may need to set some (or all) of those environment variables:

    export PKG_CONFIG_PATH="/usr/local/opt/openssl/lib/pkgconfig"
    export LDFLAGS="-L/usr/local/opt/openssl/lib"
    export CPPFLAGS="-I/usr/local/opt/openssl/include"

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