fat_free_crm 布署，运行bundle install时，到installing json(1.7.7)报错，如何解决？

@Kewin_Wang 你好，想跟你请教个问题：

我在布署Fat Free CRM时，运行bundle install 会报如下错误，请帮帮忙

Installing json (1.7.7)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension
.

    C:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb
creating Makefile

make
generating generator-i386-mingw32.def
compiling generator.c
make: gcc: Command not found
make: *** [generator.o] Error 127


Gem files will remain installed in C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9
.1/gems/json-1.7.7 for inspection.
Results logged to C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/json-1.7.
7/ext/json/ext/generator/gem_make.out
An error occurred while installing json (1.7.7), and Bundler cannot continue.
Make sure that `gem install json -v '1.7.7'` succeeds before bundling.