* Prerequisites

1. Make sure you have bison (http://www.gnu.org/software/bison/) installed in your system.

2. Make sure you have ruby installed in your system (required to build).

* Compilation and Installation

1. Run make in the top directory.

This command will create a build directory with a directory for the host environment

and one for each crossbuild environment based on the settings in the build_config.rb

file.

Assuming a default build, each of the environment directories will have the following

important directories:

* bin - The binary executables for this environment

* lib - The libraries for this environment

You can find the header files in the include directory at the root of the project.

You can directly invoke 'minirake' with the following command:

$ ruby ./minirake

If an error occurs when compiling mruby, it will be helpful for others if you

send a detailed report to the developers that includes the error log, machine,

and OS type.

* Adding existing gems

Gems from the [list of mruby gems](http://www.mruby.org/libraries/) can be added by adding

their respective GitHub URLs to build_config.rb. For example, to add implementations of the

File and IO Ruby core classes to mruby, insert the following in build_config.rb under the

comment section `Use mrbgems`:

conf.gem :git => 'git@github.com:iij/mruby-io.git', :branch => 'master'

Afterwards, re-run:

ruby ./minirake

* Porting to other platforms

That's all.