【发布时间】：2019-10-05 10:57:21
【问题描述】：
安装 jekyll（安装了 Xcode 的 macOS Mojave 10.14.6 上的 Ruby v2.6.5 上的 v4.0.0）运行任何 jekyll 命令时，例如 jekyll --version，我收到一个错误：Symbol not found: _ffi_type_double (LoadError)。
在 StackOverflow 上发现了一些与 ffi 相关的东西，但对我没有帮助。因此，我目前无法使用 jekyll……对此有什么想法吗？
这是回溯：
MacBookPro-II:~ ms1$ jekyll
Traceback (most recent call last):
23: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/ruby_executable_hooks:24:in `<main>'
22: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/ruby_executable_hooks:24:in `eval'
21: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/jekyll:23:in `<main>'
20: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/jekyll:23:in `load'
19: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-4.0.0/exe/jekyll:8:in `<top (required)>'
18: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
17: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
16: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-4.0.0/lib/jekyll.rb:206:in `<top (required)>'
15: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
14: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
13: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-sass-converter-2.0.1/lib/jekyll-sass-converter.rb:4:in `<top (required)>'
12: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
11: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
10: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-sass-converter-2.0.1/lib/jekyll/converters/scss.rb:3:in `<top (required)>'
9: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
8: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
7: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/sassc-2.2.1/lib/sassc.rb:31:in `<top (required)>'
6: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/sassc-2.2.1/lib/sassc.rb:31:in `require_relative'
5: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/sassc-2.2.1/lib/sassc/native.rb:3:in `<top (required)>'
4: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
3: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
2: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi.rb:4:in `<top (required)>'
1: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require' /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require': cannot load such file -- 2.6/ffi_c (LoadError)
24: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/ruby_executable_hooks:24:in `<main>'
23: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/ruby_executable_hooks:24:in `eval'
22: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/jekyll:23:in `<main>'
21: from /Users/ms1/.rvm/gems/ruby-2.6.5/bin/jekyll:23:in `load'
20: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-4.0.0/exe/jekyll:8:in `<top (required)>'
19: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
18: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
17: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-4.0.0/lib/jekyll.rb:206:in `<top (required)>'
16: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
15: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
14: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-sass-converter-2.0.1/lib/jekyll-sass-converter.rb:4:in `<top (required)>'
13: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
12: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
11: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/jekyll-sass-converter-2.0.1/lib/jekyll/converters/scss.rb:3:in `<top (required)>'
10: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
9: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
8: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/sassc-2.2.1/lib/sassc.rb:31:in `<top (required)>'
7: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/sassc-2.2.1/lib/sassc.rb:31:in `require_relative'
6: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/sassc-2.2.1/lib/sassc/native.rb:3:in `<top (required)>'
5: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
4: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
3: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi.rb:3:in `<top (required)>'
2: from /Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi.rb:6:in `rescue in <top (required)>'
1: from /Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in`require'/Users/ms1/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require':dlopen(/Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi_c.bundle, 9): Symbol not found: _ffi_type_double (LoadError)
Referenced from: /Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi_c.bundle
Expected in: flat namespace
in /Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi_c.bundle - /Users/ms1/.rvm/gems/ruby-2.6.5/gems/ffi-1.11.1/lib/ffi_c.bundle
MacBookPro-II:~ ms1$
【问题讨论】：