installation problem uconv-0.4.12. plz help

[bonty]

Hi guys,

I need to install Unicode Conversion Module for Ruby version 0.4.12 by
Yoshida Masato.I have followed the commands of the link inmy windows
system http://www.yoshidam.net/uconv_en.txt

but when I use the command "ruby extconf.rb" it create "MakeFile"
but when I use "make" command it fails...'make' is not recognized as a
command

so I can not install Uconv. I use ruby 1.8.5 (2006-12-25 patchlevel 12)
[i386-mswin32]

How can i solve the problem? Any other way to convert Unicode string
to Japanese string.