solution for installing mysql lib under ubuntu MySQLUbuntuRubyGCCrubygems

I've reinstalled my computer  with ubuntu,and i had to reconfiguration  my environment ,but when i  was installing mysql lib

sudo gem install mysql -r

an error occured

Building native extensions.  This could take a while...
*** 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/bin/ruby1.8
        --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
ERROR:  While executing gem ... (RuntimeError)
    ERROR: Failed to build gem native extension.
Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/mysql-2.7 for inspection.
  ruby extconf.rb install mysql
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lm... no
checking for mysql_query() in -lmysqlclient... no
checking for main() in -lz... no
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... no
checking for mysql_query() in -lmysqlclient... no


Results logged to /usr/lib/ruby/gems/1.8/gems/mysql-2.7/gem_make.out

I've installed all the required lib,why?
When i saw he mkmf.log,i knew what happened.The ubuntu didn't install gcc as default,so we sould install it.

sudo apt-get install gcc

Then install mysql lib

sudo gem install mysql -r

 1. mysql 2.7.1 (mswin32)
 2. mysql 2.7 (ruby)
 3. mysql 2.6 (ruby)
 4. mysql 2.5.1 (ruby)
 5. Cancel installation
> 2
Building native extensions.  This could take a while...
/usr/lib/ruby/1.8/fileutils.rb:243: command not found: make
/usr/lib/ruby/1.8/fileutils.rb:243: command not found: make install
ruby extconf.rb install mysql
checking for mysql_query() in -lmysqlclient... yes
checking for mysql_ssl_set()... yes
checking for mysql.h... no
checking for mysql/mysql.h... yes
creating Makefile

make

make install

Test:

irb(main):001:0> require 'mysql'
=> true
irb(main):002:0> require 'rubygems'
=> true
irb(main):003:0> require_gem 'mysql'
=> true
irb(main):004:0>