在我的工作电脑和家用电脑上，我最近使用Ruby -install将Ruby升级到2.3.1。我使用chruby作为Ruby切换器。

我开始在我的终端上看到这样的警告:

Ignoring bcrypt-3.1.11 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.11
Ignoring bcrypt-3.1.10 because its extensions are not built.  Try: gem pristine bcrypt --version 3.1.10
Ignoring binding_of_caller-0.7.2 because its extensions are not built.  Try: gem pristine binding_of_caller --version 0.7.2
Ignoring byebug-9.0.5 because its extensions are not built.  Try: gem pristine byebug --version 9.0.5
Ignoring byebug-5.0.0 because its extensions are not built.  Try: gem pristine byebug --version 5.0.0
Ignoring concurrent-ruby-ext-1.0.2 because its extensions are not built.  Try: gem pristine concurrent-ruby-ext --version 1.0.2
Ignoring debug_inspector-0.0.2 because its extensions are not built.  Try: gem pristine debug_inspector --version 0.0.2

在我的工作电脑上，清单要长得多，但很容易解决。当我尝试建议的gem原始gem时，它告诉我找不到宝石，所以我运行gem安装gem，这就解决了问题。

在家里，一切都不正常。

我从常识和其他Stack问题中尝试过的事情:

gem pristine GEM gem pristine --all uninstalling and reinstalling the gem gem update gem update --system bundle update uninstalling and reinstalling bundler uninstalling and reinstalling rails (Though, it's not a Rails specific problem.) deleting ~/.bundle/ opening XCode and letting it install some extensions (It did need to do it, but it didn't fix anything.) running brew doctor and solving all the minor issues, then brew update and brew upgrade gem install curb (I can't imagine what this gem has to do with this issue, but two different people listed it as the last step of their fix to the same warning.)