C:\ruby\bin>gem --version
0.9.4

C:\ruby\bin>gem install mongrel -y
Select which gem to install for your platform (i386-mswin32)
 1. mongrel 1.1.2 (ruby)
 2. mongrel 1.1.2 (mswin32)
 3. mongrel 1.1.1 (mswin32)
 4. mongrel 1.1.1 (ruby)
 5. mongrel 1.1.1 (jruby)
 6. Skip this gem
 7. Cancel installation
> 1
Select which gem to install for your platform (i386-mswin32)
 1. fastthread 1.0.1 (mswin32)
 2. fastthread 1.0.1 (ruby)
 3. Skip this gem
 4. Cancel installation
> 2
Building native extensions.  This could take a while...
ERROR:  While executing gem ... (Gem::Installer::ExtensionBuildError)
    ERROR: Failed to build gem native extension.

ruby extconf.rb install mongrel -y
creating Makefile

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


Gem files will remain installed in C:/ruby/lib/ruby/gems/1.8/gems/fastthread-1.0.1 for inspection.
Results logged to C:/ruby/lib/ruby/gems/1.8/gems/fastthread-1.0.1/ext/fastthread/gem_make.out

C:\ruby\bin>ruby --version
ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]

C:\ruby\bin>