在Mac OS

Question

安裝mysql2我已經安裝Ruby 2，軌道4,5和MySQL（含自制）。

我嘗試安裝寶石「mysql2」但我得到這個消息：

gem install mysql2 
Building native extensions. This could take a while... 
ERROR: Error installing mysql2: 
    ERROR: Failed to build gem native extension. 

/usr/local/rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb 
checking for rb_thread_blocking_region()... yes 
checking for rb_wait_for_single_fd()... yes 
checking for mysql.h... no 
checking for mysql/mysql.h... no 
----- 
mysql.h is missing. please check your installation of mysql and try again. 
----- 
*** 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 
--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=/usr/local/rvm/rubies/ruby-2.0.0-p247/bin/ruby 
--with-mysql-config 
--without-mysql-config 


Gem files will remain installed in /usr/local/rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.11 for inspection. 
Results logged to /usr/local/rvm/gems/ruby-2.0.0-p247/gems/mysql2-0.3.11/ext/mysql2/gem_make.out 

你能幫助我嗎？

Answer 1

出於某種原因，通過自制軟件安裝mysql已損壞。您必須手動編輯mysql_config。

自制留在/usr/local/Cellar/mysql/5.6.12/bin的mysql_config文件， 與sudo打開它，周圍線120，發現這些行：

cflags="-I$pkgincludedir -Wall -Wno-null-conversion -Wno-unused-private-field -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space! 
cxxflags="-I$pkgincludedir -Wall -Wno-null-conversion -Wno-unused-private-field -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space! 

和遠程-Wno-null-conversion -Wno-unused-private-filed兩行是這樣的：

cflags="-I$pkgincludedir -Wall -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space! 
cxxflags="-I$pkgincludedir -Wall -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space! 

保存文件，然後再執行brew install mysql，它應該工作。

檢查this blog post。