Headers and client library minor version mismatch

Question

In PHP I'm getting the following warning whenever I try to connect to a database (via mysql_connect)

Warning: mysql_connect(): Headers and client library minor version mismatch. Headers:50162 Library:50524

In my php -i output I have the following values listed under mysqli

Client API library version => 5.5.24

Client API header version => 5.1.62

I've tried updating php5-mysql and php but I'm already at the latest version of both of them. How do I go about updating the header version so I stop seeing this warning?

EDIT

My MySQL files should all be updated to be the latest version:

$ apt-get install mysql.*5.5
. . .
mysql-client-5.5 is already the newest version.
mysql-server-core-5.5 is already the newest version.
mysql-server-5.5 is already the newest version.
mysql-testsuite-5.5 is already the newest version.
mysql-source-5.5 is already the newest version.

Removing old versions

$ apt-get remove mysql.*5.1
. . .
Package handlersocket-mysql-5.1 is not installed, so not removed
Package mysql-cluster-client-5.1 is not installed, so not removed
Package mysql-cluster-server-5.1 is not installed, so not removed
Package mysql-client-5.1 is not installed, so not removed
Package mysql-client-core-5.1 is not installed, so not removed
Package mysql-server-5.1 is not installed, so not removed
Package mysql-server-core-5.1 is not installed, so not removed
Package mysql-source-5.1 is not installed, so not removed

Answer 1

I got same php warring in my wordpress site...

Err: Warning: mysql_connect(): Headers and client library minor version mismatch. Headers:50547 Library:50628 in /home/lhu/public_html/innovacarrentalschennai.com/wp-includes/wp-db.php on line 1515

Cause: I updated wp 4.2 to 4.5 version (PHP and MySql mismatch )

I changed wp-db.php on line 1515

$this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );

to

if ( WP_DEBUG ) {
    $this->dbh = mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
} else {
    $this->dbh = @mysql_connect( $this->dbhost, $this->dbuser, $this->dbpassword, $new_link, $client_flags );
}

Its got without warring err on my wordpress site