'require'：無法加載這樣的文件--mysql（LoadError）

Question

當我嘗試運行一個ruby文件「ruby DisplayWishes.rb」時，我收到一個require load error。 我安裝了以下mysql的包，看它是否會幫助目前沒有什麼工作：

sudo apt-get install ruby-mysql 
sudo apt-get install ruby-mysql2 

/usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in 'require':cannot load such file -- mysql(LoadError) 
from /usr/local/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in 'require' 
from DisplayWishes.rb:3:in '<main>' 

當我試圖寶石安裝mysql & mysql2

sudo gem install mysql2 
Fetching: mysql2-0.3.15.gem (100%) 
Building native extensions. This could take a while... 
ERROR: Error installing mysql2: 
ERROR: Failed to build gem native extension. 

/usr/local/bin/ruby extconf.rb 
checking for ruby/thread.h... yes 
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes 
checking for rb_thread_blocking_region()... yes 
checking for rb_wait_for_single_fd()... yes 
checking for rb_hash_dup()... yes 
checking for rb_intern3()... yes 
checking for mysql_query() in -lmysqlclient... no 
checking for main() in -lm... yes 
checking for mysql_query() in -lmysqlclient... no 
checking for main() in -lz... yes 
checking for mysql_query() in -lmysqlclient... no 
checking for main() in -lsocket... no 
checking for mysql_query() in -lmysqlclient... no 
checking for main() in -lnsl... yes 
checking for mysql_query() in -lmysqlclient... no 
checking for main() in -lmygcc... no 
checking for mysql_query() in -lmysqlclient... no 
*** 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. 

Answer 1

我遇到了在FreeBSD上這個問題，通過運行安裝了所需的庫：

pkg_add -rv mysql56-client 

我當時能夠安裝mysql和mysql2 gems。