更新了最新的Mac系统，升级到maxOS Big Sur和Xcode12.5之后，执行pod 总是报错，

Pod Install: Ignoring ffi-1.13.1 because its extensions are not built. Try: gem pristine ffi --version 1.13.1

在网上搜索发现国内的博客都是拷贝复制，没有真正解决问题，然后自己折腾，终于解决。分享一下。

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首先，看报错日志，然后 执行

sudo gem pristine ffi

然后还有报错信息如下：

/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/dependency.rb:311:in `to_specs': Could not find 'ffi' (>= 1.3.0) among 84 total gem(s) (Gem::MissingSpecError) Checked in 'GEM_PATH=/Users/dylan/.gem/ruby/2.6.0:/Library/Ruby/Gems/2.6.0:/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/gems/2.6.0', execute `gem env` for more information

安装更新cocoapods，以下命令没有权限的话，可以都在前面加上sudo

gem install cocoapods

如果出现如下的报错信息，就执行下面的命令。

You might have to install separate package for the ruby development environment, ruby-dev or ruby-devel for example.

xcode-select --install

再执行上面的?gem install cocoapods 命令。成功后日志如下： Building native extensions. This could take a while... Successfully installed ffi-1.13.1 Successfully installed public_suffix-4.0.6 Successfully installed addressable-2.7.0 Successfully installed cocoapods-core-1.10.0 Successfully installed cocoapods-downloader-1.4.0 Successfully installed nanaimo-0.3.0 Successfully installed xcodeproj-1.19.0 Successfully installed cocoapods-1.10.0

......

8 gems installed? ? ? 说明成功

最后可以输入命令?pod --version? 能够成功查看到版本，解决成功。

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