1.2.3

## Building Rubinius

You can build and run Rubinius from the source directory. You do not need to install Rubinius to run it. The directions below will detail both installing Rubinius and running it from the source directory.

Rubinius uses LLVM for the JIT compiler. Rubinius depends on a particular version of LLVM and LLVM must be built with C++ RTTI (run-time type information) enabled. The `configure` script will automatically verify these requirements when searching for an installed version of LLVM. If you do have LLVM installed and Rubinius fails to link with it for any reason, pass `--skip-system` to the `configure` script in the directions below.

### Getting the Source

The Rubinius source code is available as a tarball and as a project on Github. You can download the tarball here.

To use Git:

1. Change your current working directory to your development directory
2. `git clone git://github.com/rubinius/rubinius.git`

### Installing Rubinius

If you are planning on using Rubinius to run your application, this is a good option. However, you can also run Rubinius directly from the source directory. See the next section for more details on that.

We recommend installing Rubinius to a location that does not require `sudo` or superuser privileges. To install Rubinius:

1. `./configure --prefix=/path/to/install/dir`
2. `rake install`
3. Follow the directions to add the Rubinius bin directory to your PATH

### Running from the Source Directory

If you plan to work on Rubinius itself, you should use this option.

1. `./configure`
2. `rake`

If you are just trying out Rubinius, follow the directions to add the bin directory to your PATH.

However, if you are developing Rubinius, you should NOT add the bin directory to your PATH because the Rubinius build system will pick up the `ruby` and `rake` links to the Rubinius executable. Rubinius needs a separate Ruby executable to bootstrap itself during the build process.