我尝试运行gem pristine --all，并且我一直在控制台中获取这些信息。为什么我在运行“gem pristine -all”后不断收到这些错误
当我运行gem pristine --all我得到这个：
Permission denied ....
我甚至想，每gem做gem install，仍然可以得到这样的：
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-5.0.0 because its extensions are not built. Try: gem pristine byebug --version 5.0.0 Ignoring debug_inspector-0.0.2 because its extensions are not built. Try: gem pristine debug_inspector --version 0.0.2 Ignoring executable-hooks-1.3.2 because its extensions are not built. Try: gem pristine executable-hooks --version 1.3.2 Ignoring gem-wrappers-1.2.7 because its extensions are not built. Try: gem pristine gem-wrappers --version 1.2.7 Ignoring json-1.8.3 because its extensions are not built. Try: gem pristine json --version 1.8.3 Ignoring mysql-2.9.1 because its extensions are not built. Try: gem pristine mysql --version 2.9.1 Ignoring mysql2-0.3.18 because its extensions are not built. Try: gem pristine mysql2 --version 0.3.18 Ignoring nokogiri-1.6.6.2 because its extensions are not built. Try: gem pristine nokogiri --version 1.6.6.2 Ignoring pg-0.18.2 because its extensions are not built. Try: gem pristine pg --version 0.18.2