我正在尝试安装mysql gem，版本：2.7虽然它给出了一个错误：
Building native extensions. This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb
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
*** 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=/usr/local/bin/ruby
--with-mysql-config
--without-mysql-config
--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-mysqlclientlib
--without-mysqlclientlib
--with-mlib
--without-mlib
--with-mysqlclientlib
--without-mysqlclientlib
--with-zlib
--without-zlib
--with-mysqlclientlib
--without-mysqlclientlib
--with-socketlib
--without-socketlib
--with-mysqlclientlib
--without-mysqlclientlib
--with-nsllib
--without-nsllib
--with-mysqlclientlib
--without-mysqlclientlib
Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/mysql-2.7 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.8/gems/mysql-2.7/gem_make.out
虽然我尝试的时候：
sudo gem install mysql -- version "=2.7" --with-mysql-config=/usr/bin/mysql_config
它确实安装了mysql gem但版本为2.8.1并且输出如下：
Building native extensions. This could take a while...
Successfully installed mysql-2.8.1
1 gem installed
Installing ri documentation for mysql-2.8.1...
No definition for next_result
No definition for field_name
No definition for field_table
No definition for field_def
No definition for field_type
No definition for field_length
No definition for field_max_length
No definition for field_flags
No definition for field_decimals
No definition for time_inspect
No definition for time_to_s
No definition for time_get_year
No definition for time_get_month
No definition for time_get_day
No definition for time_get_hour
No definition for time_get_minute
No definition for time_get_second
No definition for time_get_neg
No definition for time_get_second_part
No definition for time_set_year
No definition for time_set_month
No definition for time_set_day
No definition for time_set_hour
No definition for time_set_minute
No definition for time_set_second
No definition for time_set_neg
No definition for time_set_second_part
No definition for time_equal
No definition for error_errno
No definition for error_sqlstate
Installing RDoc documentation for mysql-2.8.1...
No definition for next_result
No definition for field_name
No definition for field_table
No definition for field_def
No definition for field_type
No definition for field_length
No definition for field_max_length
No definition for field_flags
No definition for field_decimals
No definition for time_inspect
No definition for time_to_s
No definition for time_get_year
No definition for time_get_month
No definition for time_get_day
No definition for time_get_hour
No definition for time_get_minute
No definition for time_get_second
No definition for time_get_neg
No definition for time_get_second_part
No definition for time_set_year
No definition for time_set_month
No definition for time_set_day
No definition for time_set_hour
No definition for time_set_minute
No definition for time_set_second
No definition for time_set_neg
No definition for time_set_second_part
No definition for time_equal
No definition for error_errno
No definition for error_sqlstate
命令行参数存在一些问题，但我无法得到它。 提前谢谢。
答案 0 :(得分：1)
你的gem install命令中有一个流氓空间：sudo gem install mysql - version“= 2.7”--with-mysql-config = / usr / bin / mysql_config
尝试：
sudo gem install mysql --version "=2.7" --with-mysql-config=/usr/bin/mysql_config
我在本地运行命令，并为我正确安装了gem install mysql --version "=2.7"。