Failed to install Toto gem under Windows XP Professional SP3

Could some one help?

I tried the installation in both remote and local way, it kept throwing out error as below:

D:\02_RoR\ruby>gem install toto -v 0.4.6
Building native extensions. This could take a while...
ERROR: Error installing toto:
ERROR: Failed to build gem native extension.

D:/02_RoR/ruby/bin/ruby.exe extconf.rb
checking for random()... no
checking for srandom()... no
checking for rand()... no
checking for srand()... no
creating Makefile

nmake
'nmake' is not recognized as an internal or external command,
operable program or batch file.

Gem files will remain installed in D:/02_RoR/ruby/lib/ruby/gems/1.8/gems/rdiscou
nt-1.6.5 for inspection.
Results logged to D:/02_RoR/ruby/lib/ruby/gems/1.8/gems/rdiscount-1.6.5/ext/gem_
make.out

Is it an incompatible issue? Is there any windows-compatible verson of Toto?

Thanks a lot!