应该怎么解决呢 T_T

谢谢各位前辈的指导，我都尝试了但是还是没能解决。。。555 我又重新创建了一个 app，可是进不去该目录，代码如下：

chihwoo:// goki$ rails new tweet_app
      create  
/Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:253:in `mkdir': Permission denied @ dir_s_mkdir - /tweet_app (Errno::EACCES)
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:253:in `fu_mkdir'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:227:in `block (2 levels) in mkdir_p'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:225:in `reverse_each'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:225:in `block in mkdir_p'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:211:in `each'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/2.3.0/fileutils.rb:211:in `mkdir_p'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:50:in `block in invoke!'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:116:in `invoke_with_conflict_check'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:49:in `invoke!'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/actions.rb:94:in `action'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/actions/empty_directory.rb:14:in `empty_directory'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.6/lib/rails/generators/app_base.rb:138:in `create_root'
    from (eval):1:in `create_root'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/command.rb:27:in `run'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:126:in `invoke_command'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `block in invoke_all'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `each'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `map'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/invocation.rb:133:in `invoke_all'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/group.rb:232:in `dispatch'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/thor-0.19.1/lib/thor/base.rb:440:in `start'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.6/lib/rails/commands/application.rb:17:in `<top (required)>'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:59:in `require'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:59:in `require'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.6/lib/rails/cli.rb:14:in `<top (required)>'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:59:in `require'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/site_ruby/2.3.0/rubygems/core_ext/kernel_require.rb:59:in `require'
    from /Users/goki/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/railties-4.2.6/bin/rails:9:in `<top (required)>'
    from /Users/goki/.rbenv/versions/2.3.0/bin/rails:23:in `load'
    from /Users/goki/.rbenv/versions/2.3.0/bin/rails:23:in `<main>'
chihwoo:// goki$ cd tweet_app
-bash: cd: tweet_app: No such file or directory
chihwoo:// goki$ 

请问是什么原因呢？

十分感谢。

多谢，这就去搜一搜。

好的，我试试看，谢谢！

请教有没有最新的安装教程呢？ 人在海外。谢啦

Error: Your Xcode (7.3.1) is too outdated.
Please update to Xcode 9.4 (or delete it).
Xcode can be updated from the App Store.

好像提示我 Xcode 的版本低。。。我正在升级试试看。

谢谢回复。 gem_make.out 里的内容如下。 如何看哪里爆了呢？

current directory: /Users/goki/tong_app/vendor/bundle/gems/nokogiri-1.8.2/ext/nokogiri
/Users/goki/.rbenv/versions/2.3.0/bin/ruby -r ./siteconf20180609-10739-7kuq0s.rb extconf.rb --use-system-libraries
checking if the C compiler accepts ... yes
checking if the C compiler accepts -Wno-error=unused-command-line-argument-hard-error-in-future... no
Building nokogiri using system libraries.
checking for xmlParseDoc() in libxml/parser.h... yes
checking for xsltParseStylesheetDoc() in libxslt/xslt.h... yes
checking for exsltFuncRegister() in libexslt/exslt.h... yes
checking for xmlHasFeature()... yes
checking for xmlFirstElementChild()... yes
checking for xmlRelaxNGSetParserStructuredErrors()... yes
checking for xmlRelaxNGSetParserStructuredErrors()... yes
checking for xmlRelaxNGSetValidStructuredErrors()... yes
checking for xmlSchemaSetValidStructuredErrors()... yes
checking for xmlSchemaSetParserStructuredErrors()... yes
creating Makefile

current directory: /Users/goki/tong_app/vendor/bundle/gems/nokogiri-1.8.2/ext/nokogiri
make "DESTDIR=" clean

current directory: /Users/goki/tong_app/vendor/bundle/gems/nokogiri-1.8.2/ext/nokogiri
make "DESTDIR="
compiling html_document.c
couldn't understand kern.osversion `16.7.0'
In file included from /Users/goki/.rbenv/versions/2.3.0/include/ruby-2.3.0/ruby.h:33,
                 from ./nokogiri.h:33,
                 from ./html_document.h:4,
                 from html_document.c:1:
/Users/goki/.rbenv/versions/2.3.0/include/ruby-2.3.0/ruby/ruby.h:926: error: wrong number of arguments specified for ‘deprecated’ attribute
/Users/goki/.rbenv/versions/2.3.0/include/ruby-2.3.0/ruby/ruby.h:1419: error: wrong number of arguments specified for ‘deprecated’ attribute
/Users/goki/.rbenv/versions/2.3.0/include/ruby-2.3.0/ruby/ruby.h:1428: error: wrong number of arguments specified for ‘deprecated’ attribute
make: *** [html_document.o] Error 1

make failed, exit code 2

chihwoo:~ goki$ brew install libxml2 libxslt
Error: libxml2 2.9.4 is already installed
To upgrade to 2.9.7, run `brew upgrade libxml2`
Error: libxslt 1.1.28_1 is already installed
To upgrade to 1.1.32, run `brew upgrade libxslt`

谢谢，貌似没有问题。

支持！下周五晚上到台北，估计赶不上了...

感觉身边的エンジニア用 mac 的多...