Correct if it is possible   
----- 
Installing "mysql" Ruby Gem    
ERROR:  Error installing mysql: 
ERROR: Failed to build gem native extension.   
/usr/bin/ruby extconf.rb 
checking for mysql_ssl_set()... no 
checking for rb_str_set_len()... no 
checking for rb_thread_start_timer()... no 
checking for mysql.h... no 
checking for mysql/mysql.h... no 
*** extconf.rb failed *** 
Could not create Makefile due to some reason, probably lack of 
necessary libraries and/or headers.