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    # Languages and Services
    
     * Unix-like environment (Linux, OS X, or a virtual machine)
     * [PHP v5.3+](http://php.net/)
     * [MySQL v5.1+](http://mysql.com/)
     * [NodeJS](https://nodejs.org/)
     * [Git](https://git-scm.com/)
     * Recommended: Apache HTTPD v2.2+
     * Recommended: Ruby/Rake
    
    # Command Line
    
    There are many ways to install MySQL, PHP, and other dependencies -- for
    example, `apt-get` and `yum` can download packages automatically; `php.net`
    and `mysql.com` provide standalone installers; and MAMP/XAMPP provide
    bundled installers.
    
    Civi development should work with most packages -- but there's one proviso:
    ***the command-line must support standard commands*** (`php`, `mysql`,
    `node`, `git`, `bash`, etc).
    
    Some packages are configured properly out-of-the-box. (Linux distributions
    do a pretty good job of this.) Other packages require extra configuration
    steps (e.g.  [Setup Command Line
    PHP](http://wiki.civicrm.org/confluence/display/CRMDOC/Setup+Command-Line+PHP)
    for MAMP).
    
    In subsequent steps, the download script will attempt to identify
    misconfigurations and display an appropriate message.
    
    # Buildkit
    
    The developer docs reference a large number of developer tools, such as
    `drush` (the Drupal command line), `civix` (the CiviCRM code-generator), and
    `karma` (the Javascript tester).
    
    Many of these tools are commonly used by web developers, so you may have
    already installed a few.  You could install all the tools individually --
    but that takes a lot of work.
    
    [civicrm-buildkit](https://github.com/civicrm/civicrm-buildkit) provides
    a script which downloads the full collection.
    
    ### - Option #1: Full Stack Ubuntu (Opinionated)
    
    If you have a new installation of Ubuntu 12.04 or 14.04, then you can download everything -- buildkit and the system
    requirements (`git`, `php`, `apache`, `mysql`, etc) -- with one command.  This command will install buildkit to `~/buildkit`:
    
    ```bash
    curl -Ls https://civicrm.org/get-buildkit.sh | bash -s -- --full --dir ~/buildkit
    ```
    
    Note:
    
     * When executing the above command, you must ***NOT*** run as `root`. (Doing so will produce incorrect permissions.)
       Instead, you must have `sudo` permissions.
     * The `--full` option is opinionated; it specifically installs `php`, `apache`, and `mysql` (rather than `hvm`, `nginx`, `lighttpd`, or `percona`).
       If you try to mix `--full` with alternative systems, then expect conflicts.
    
    
    ### - Option #2: Other Systems
    
    If you already installed the requirements (`git`, `php`, etc), then you can download buildkit to `~/buildkit` with these commands:
    
    ```bash
    git clone https://github.com/civicrm/civicrm-buildkit.git buildkit
    cd buildkit/bin
    ./civi-download-tools
    export PATH="$PWD:$PATH"
    ```
    
    ### - Option #3: Upgrade
    
    If you have previously downloaded buildkit and want to update it, run:
    
    ```bash
    cd buildkit
    git pull
    ./bin/civi-download-tools
    ```