Redmine

D:\redmine-3.1.0>bundle install
Fetching gem metadata from https://rubygems.org/.........
Fetching version metadata from https://rubygems.org/..
Resolving dependencies....
Using rake 10.4.2
Using i18n 0.7.0

Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension
.

G:/Ruby193/bin/ruby.exe extconf.rb
creating Makefile

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

Gem files will remain installed in G:/Ruby193/lib/ruby/gems/1.9.1/gems/json-1.8.
3 for inspection.
Results logged to G:/Ruby193/lib/ruby/gems/1.9.1/gems/json-1.8.3/ext/json/ext/ge
nerator/gem_make.out
An error occurred while installing json (1.8.3), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.3'` succeeds before bundling.