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.

Gems from the [list of mruby gems](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

That’s all.

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