# It also works with MRB_NO_STDIO and MRB_NO_FLOAT.
MRuby::GemBox.new do |conf|
# Use standard Array#pack, String#unpack methods
conf.gem :core => "mruby-pack"
# Use standard Kernel#sprintf method
conf.gem :core => "mruby-sprintf"
# Use standard Time class
conf.gem :core => "mruby-time"
# Use standard Struct class
conf.gem :core => "mruby-struct"
# Use standard Data class
conf.gem :core => "mruby-data"
# Use Random class
conf.gem :core => "mruby-random"
end