Jekyllrb还是有必要了解一下。
错误信息
弄了半天把Ruby和Gem环境弄好，运行 bundle install 后报错。
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$ bundle install Traceback (most recent call last):
1: from /Users/ivolooser/gems/bin/bundle:23:in `<main>'
/Users/ivolooser/gems/bin/bundle:23:in `load': cannot load such file -- /usr/local/lib/ruby/gems/2.6.0/gems/bundler-1.17.2/exe/bundle (LoadError)
解决办法
把需要的Bundle版本全都给它装上，现在错误的是没有1.17.2，那么开装：
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$ gem install bundler -v '1.17.3' Successfully installed bundler-1.17.3
Parsing documentation for bundler-1.17.3
Done installing documentation for bundler after 3 seconds
1 gem installed
再运行 bundle install，还是报错。
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Can't find gem bundler (= 1.11.2) with executable bundle (Gem::GemNotFoundException)
应该是Gemfile.lock里写死了指定版本的Bundler才可以运行网站，那么再装：
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$ gem install bundler -v '1.11.2' Successfully installed bundler-1.11.2
Parsing documentation for bundler-1.12.2
Done installing documentation for bundler after 3 seconds
1 gem installed
再来运行 bundle install，搞定。
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$ bundle install
...
Bundle complete! 10 Gemfile dependencies, 30 gems now installed.