尝试从 github 构建 masstransit 源时，我不断收到以下错误：
Building for .NET 3.5
rake aborted!
no such file to load -- semver
(See full trace by running task with --trace)
使用 --trace 开关，我得到：
Building for .NET 3.5
rake aborted!
no such file to load -- semver
C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
C:/Users/****/Dev/Scratch/MassTransit/build_support/versioning.rb:1:in `<top (required)>'
C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
C:/Users/****/Dev/Scratch/MassTransit/rakefile.rb:10:in `<top (required)>'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/rake_module.rb:25:in `load_rakefile'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:495:in `raw_load_rakefile'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:78:in `block in load_rakefile'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:77:in `load_rakefile'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:61:in `block in run'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:129:in `standard_exception_handling'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/lib/rake/application.rb:59:in `run'
C:/Ruby192/lib/ruby/gems/1.9.1/gems/rake-0.9.2/bin/rake:32:in `<top (required)>'
C:/Ruby192/bin/rake:19:in `load'
C:/Ruby192/bin/rake:19:in `<main>'
这应该能够开箱即用还是我错过了什么？