Mruby-require error: NoMethodError: undefined method 'puts' for main

I managed to compile the mruby code by adding mrubygem - mruby-require from https://github.com/mattn/mruby-require

However, when I try to call require './', I get an error. Below is my code:

inc.rb

def test(a, b)
    print "Inside the include->test(..)"
    return a+b
end

      

        
        
        
      

    

test1.rb

require 'inc.rb'

def helloworld(var1)
    print 'hello world ' + var1 + ". Test number = " + test(4, 5)

end

helloworld('test')

      

        
        
        
      

    

When I execute test1.rb I get this error from mruby:

NoMethodError: undefined method 'puts' for main

      

        
        
        
      

    

After some analysis, I found out that "puts" does not work with mruby. Infact after adding mruby-require gem, ruby ​​code will not be executed. Do I need to add any dependency using mruby-require?

Can anyone help me?

Update: Pasting the contents of build_config.rb as requested. I removed the lines that are commented out.

build_config.rb

MRuby::Build.new do |conf|

  if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
    toolchain :visualcpp
  else
    toolchain :gcc
  end

  enable_debug

  # adding the mruby-require library
  conf.gem 'mrbgems/mruby-require'

  conf.gembox 'default'


end

MRuby::Build.new('host-debug') do |conf|

  if ENV['VisualStudioVersion'] || ENV['VSINSTALLDIR']
    toolchain :visualcpp
  else
    toolchain :gcc
  end

  enable_debug

  conf.gembox 'default'


  conf.cc.defines = %w(ENABLE_DEBUG)


  conf.gem :core => "mruby-bin-debugger"


end