尝试了许多建议，如何安装mysql2 gem？

Question

I'm trying to install a mysql2 gem on a ruby on rails app. I'm currently running Ubuntu 11.04 and this is the error I get when I run sudo gem install mysql2 or bundle install :

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

/usr/bin/ruby1.8 extconf.rb
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... no
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
creating Makefile

make
gcc -I. -I. -I/usr/lib/ruby/1.8/x86_64-linux -I. -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H    -I/usr/include/mysql -DBIG_JOINS=1  -fno-strict-aliasing  -g -fPIC -fno-strict-aliasing -g -g -O2  -fPIC  -Wall -funroll-loops  -c client.c
gcc -I. -I. -I/usr/lib/ruby/1.8/x86_64-linux -I. -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H    -I/usr/include/mysql -DBIG_JOINS=1  -fno-strict-aliasing  -g -fPIC -fno-strict-aliasing -g -g -O2  -fPIC  -Wall -funroll-loops  -c mysql2_ext.c
./client.h:16:1: warning: ‘rb_thread_blocking_region’ defined but not used
gcc -I. -I. -I/usr/lib/ruby/1.8/x86_64-linux -I. -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H    -I/usr/include/mysql -DBIG_JOINS=1  -fno-strict-aliasing  -g -fPIC -fno-strict-aliasing -g -g -O2  -fPIC  -Wall -funroll-loops  -c result.c
gcc -shared -o mysql2.so client.o mysql2_ext.o result.o -L. -L/usr/lib -L. -Wl,-Bsymbolic-functions -rdynamic -Wl,-export-dynamic -Wl,-rpath,/usr/lib/x86_64-linux-gnu    -lruby1.8 -L/usr/lib/x86_64-linux-gnu -lmysqlclient_r -lpthread -lz -lm -lrt -ldl  -lpthread -lrt -ldl -lcrypt -lm   -lc
/usr/bin/ld: cannot find -lmysqlclient_r
collect2: ld returned 1 exit status
make: *** [mysql2.so] Error 1


Gem files will remain installed in /var/lib/gems/1.8/gems/mysql2-0.3.11 for inspection.
Results logged to /var/lib/gems/1.8/gems/mysql2-0.3.11/ext/mysql2/gem_make.out

I've tried installing with mysql_config, I've installed the libmysqlclient-dev and libmysql-ruby libraries, I've tried uninstalling and reinstalling mysql. None of it works. I am able to successfully install mysql gem but not mysql2.

I'm running ruby1.8 and Rails 2.3.5. Can anyone help me out?

Answer 1

try this:

sudo apt-get install libmysql-ruby

sudo apt-get install libmysqlclient-dev

sudo gem install mysql2

Answer 2

If you are running CentOS/Redhat, try install the following packages (using yum):

MySQL-devel-5.5.22-1.el6.x86_64
MySQL-shared-5.5.22-1.el6.x86_64
MySQL-shared-compat-5.5.22-2.el6.x86_64

Answer 3

Look at this blog and others like it. But ultimately, I recommend upgrading from 11.04 to 11.10. I experienced many strange errors when running 11.04, since moving to 11.10 everything is much more stable.