Failing to gem update


#1

Hi, I keep on receiving the following error when I try to gem update:

Updating installed gems
Updating facebooker
Building native extensions. This could take a while…
ERROR: While executing gem … (Gem::Installer::ExtensionBuildError)
ERROR: Failed to build gem native extension.

c:/ruby/bin/ruby.exe extconf.rb update
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/json-1.1.3 for inspection.
Results logged to
c:/ruby/lib/ruby/gems/1.8/gems/json-1.1.3/ext/json/ext/parser/gem_make.out

Here is my rails installation info:

  • RUBYGEMS VERSION: 1.3.1
  • RUBY VERSION: 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]
  • INSTALLATION DIRECTORY: c:/ruby/lib/ruby/gems/1.8
  • RUBY EXECUTABLE: c:/ruby/bin/ruby.exe
  • EXECUTABLE DIRECTORY: c:/ruby/bin
  • RUBYGEMS PLATFORMS:
    • ruby
    • x86-mswin32-60
  • GEM PATHS:
    • c:/ruby/lib/ruby/gems/1.8
    • c:/.gem/ruby/1.8
  • GEM CONFIGURATION:
    • :update_sources => true
    • :verbose => true
    • :benchmark => false
    • :backtrace => false
    • :bulk_threshold => 1000
  • REMOTE SOURCES:

Any help will be appreciated!