如何解决错误：安装 racc 时出错：错误：无法构建 gem 本机扩展
- Ubuntu 20.04.2 LTS
- 安装 Rails 6.1.3.1
- Ruby：2.6.5
安装导轨：
gem install rails -v 6.1.3.1 --no-doc
无法安装racc-1.5.2
尝试手动安装racc-1.5.2：
gem install racc -v '1.5.2' --source 'https://rubygems.org/' --no-doc
产生同样的错误。
$ gem install rails -v 6.1.3.1 --no-doc
Fetching racc-1.5.2.gem
Fetching zeitwerk-2.4.2.gem
...
Successfully installed rack-2.2.3
Successfully installed rack-test-1.1.0
Building native extensions. This Could take a while...
ERROR: Error installing rails:
ERROR: Failed to build gem native extension.
current directory: /home/user/.rvm/gems/ruby-2.6.5@gemset/gems/racc-1.5.2/ext/racc/cparse
/home/user/.rvm/rubies/ruby-2.6.5/bin/ruby -I /home/user/.rvm/rubies/ruby-2.6.5/lib/ruby/site_ruby/2.6.0 -r ./siteconf20210503-658786-pkp97m.rb extconf.rb
checking for rb_ary_subseq()... yes
creating Makefile
current directory: /home/user/.rvm/gems/ruby-2.6.5@gemset/gems/racc-1.5.2/ext/racc/cparse
make "DESTDIR=" clean
current directory: /home/user/.rvm/gems/ruby-2.6.5@gemset/gems/racc-1.5.2/ext/racc/cparse
make "DESTDIR="
compiling cparse.c
linking shared-object racc/cparse.so
current directory: /home/user/.rvm/gems/ruby-2.6.5@gemset/gems/racc-1.5.2/ext/racc/cparse
make "DESTDIR=" install
make: /usr/bin/mkdir: Command not found
make: *** [Makefile:202: .sitearchdir.-.racc.time] Error 127
make install Failed,exit code 2
Gem files will remain installed in /home/user/.rvm/gems/ruby-2.6.5@gemset/gems/racc-1.5.2 for inspection.
Results logged to /home/user/.rvm/gems/ruby-2.6.5@gemset/extensions/x86_64-linux/2.6.0/racc-1.5.2/gem_make.out
解决方法
这里的主要问题是命令 mkdir 在特定位置被调用，但它并不存在：
make: /usr/bin/mkdir: Command not found
要解决此问题，您需要添加指向该位置的符号链接：
$ sudo ln -s /bin/mkdir /usr/bin/mkdir
在 gem install 上再次运行 rails，一切都会好的！
感谢用户 dem1tris 提出相关主题并提供答案：make: /usr/bin/mkdir: Command not found during `gem install nokogiri` in Ubuntu 20.04
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