1. 更新了系统，发现 $ sudo gem install cocoapods 安装报错。
$ sudo gem install cocoapods
Password:
Building native extensions. This could take a while...
/Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/rubygems/ext/builder.rb:76: warning: Insecure world writable dir /usr/local/mysql in PATH, mode 040777
ERROR: Error installing cocoapods:
ERROR: Failed to build gem native extension.
current directory: /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0/gems/ffi-1.13.1/ext/ffi_c
/Users/WeepYan/.rvm/rubies/ruby-2.6.0/bin/ruby -I /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0 -r ./siteconf20201208-3504-1o2g6p3.rb extconf.rb
/Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/mkmf.rb:1565: warning: Insecure world writable dir /usr/local/mysql in PATH, mode 040777
checking for ffi.h... no
checking for ffi.h in /usr/local/include,/usr/include/ffi,/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include/ffi,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/ffi... yes
checking for ffi_prep_closure_loc() in -lffi... yes
checking for ffi_prep_cif_var()... yes
checking for ffi_raw_call()... yes
checking for ffi_prep_raw_closure()... yes
creating extconf.h
creating Makefile
current directory: /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0/gems/ffi-1.13.1/ext/ffi_c
make "DESTDIR=" clean
current directory: /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0/gems/ffi-1.13.1/ext/ffi_c
make "DESTDIR="
compiling AbstractMemory.c
compiling ArrayType.c
compiling Buffer.c
compiling Call.c
compiling ClosurePool.c
compiling DynamicLibrary.c
compiling Function.c
compiling FunctionInfo.c
compiling LastError.c
compiling LongDouble.c
compiling MappedType.c
compiling MemoryPointer.c
compiling MethodHandle.c
compiling Platform.c
compiling Pointer.c
compiling Struct.c
compiling StructByValue.c
compiling StructLayout.c
compiling Thread.c
compiling Type.c
compiling Types.c
compiling Variadic.c
compiling ffi.c
linking shared-object ffi_c.bundle
ld: warning: directory not found for option '-L/usr/local/opt/libksba/lib'
ld: warning: directory not found for option '-L/usr/local/opt/libksba/lib'
ld: warning: directory not found for option '-L/usr/local/opt/libksba/lib'
current directory: /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0/gems/ffi-1.13.1/ext/ffi_c
make "DESTDIR=" install
make: /usr/local/opt/coreutils/bin/gmkdir: No such file or directory
make: *** [.sitearchdir.time] Error 1
make install failed, exit code 2
Gem files will remain installed in /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0/gems/ffi-1.13.1 for inspection.
Results logged to /Users/WeepYan/.rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0/extensions/x86_64-darwin-17/2.6.0/ffi-1.13.1/gem_make.out
2. 安装 coreutils即可 $ brew install coreutils
$ brew install coreutils
Updating Homebrew...
==> Downloading https://homebrew.bintray.com/bottles/coreutils-8.32.catalina.bot
==> Downloading from https://d29vzk4ow07wi7.cloudfront.net/f40ba727ec1bb54300c7c
######################################################################## 100.0%
==> Pouring coreutils-8.32.catalina.bottle.1.tar.gz
==> Caveats
Commands also provided by macOS have been installed with the prefix "g".
If you need to use these commands with their normal names, you
can add a "gnubin" directory to your PATH from your bashrc like:
PATH="/usr/local/opt/coreutils/libexec/gnubin:$PATH"
==> Summary
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