Error to gem install mysql

in my console:
pt@pt-laptop:~$ sudo gem install mysql
[sudo] password for pt:
Building native extensions. This could take a while...
ERROR: Error installing mysql:
  ERROR: Failed to build gem native extension.

/usr/local/ruby/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
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.

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/ruby/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
  --with-mygcclib
  --without-mygcclib
  --with-mysqlclientlib
  --without-mysqlclientlib

Gem files will remain installed in
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql-2.8.1 for inspection.
Results logged to
/usr/local/ruby/lib/ruby/gems/1.9.1/gems/mysql-2.8.1/ext/mysql_api/gem_make.out

how can i do?
think you in advance.

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Pen Ttt wrote:

how can i do?

Likely you are missing mysql client development libraries. How to fix
this depends on what platform you are on.

e.g. for ubuntu Linux it's usually
[sudo] apt-get install libmysqlclient-dev

(or libmysqlclient15-dev or libmysqlclient16-dev to force a particular
version)

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