在学习教程时，我在运行rails服务器时出错，该服务器显示
在rubygems存储库中找不到gem"mysql2(~>0.5("https://rubygems.org/或本地安装。来源没有包含任何版本的"mysql2"运行
bundle install以安装丢失的gem。
后来我运行了建议的命令，再次出现错误
Installing mysql2 0.5.3 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory:
C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/mysql2-0.5.3/ext/mysql2
C:/Ruby30-x64/bin/ruby.exe -I C:/Ruby30-x64/lib/ruby/3.0.0 -r
./siteconf20210723-9416-we9bmo.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_wait_for_single_fd()... yes
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.
Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=C:/Ruby30-x64/bin/$(RUBY_BASE_NAME)
--with-mysql-dir
--without-mysql-dir
--with-mysql-include
--without-mysql-include=${mysql-dir}/include
--with-mysql-lib
--without-mysql-lib=${mysql-dir}/lib
--with-mysql-config
--without-mysql-config
--with-mysqlclient-dir
--without-mysqlclient-dir
--with-mysqlclient-include
--without-mysqlclient-include=${mysqlclient-dir}/include
--with-mysqlclient-lib
--without-mysqlclient-lib=${mysqlclient-dir}/lib
--with-mysqlclientlib
--without-mysqlclientlib
C:/Ruby30-x64/lib/ruby/3.0.0/mkmf.rb:1050:in `block in find_library': undefined
method `split' for nil:NilClass (NoMethodError)
from C:/Ruby30-x64/lib/ruby/3.0.0/mkmf.rb:1050:in `collect'
from C:/Ruby30-x64/lib/ruby/3.0.0/mkmf.rb:1050:in `find_library'
from extconf.rb:87:in `<main>'
To see why this extension failed to compile, please check the mkmf.log which can
be found here:
C:/Ruby30-x64/lib/ruby/gems/3.0.0/extensions/x64-mingw32/3.0.0/mysql2-0.5.3/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in
C:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/mysql2-0.5.3 for inspection.
Results logged to
C:/Ruby30-x64/lib/ruby/gems/3.0.0/extensions/x64-mingw32/3.0.0/mysql2-0.5.3/gem_make.out
An error occurred while installing mysql2 (0.5.3), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.3' --source 'https://rubygems.org/'`
succeeds before bundling.
In Gemfile:
mysql2
如果有人能帮我解决这个问题，我将不胜感激，非常感谢。
尝试以下命令
sudo apt-get install ruby-dev
sudo apt-get install libmysqlclient-dev
sudo gem install mysql2