Roundcube install, getting MYSQL_ATTR_FOUND_ROWS fatal error

I'm installing Roundcube 0.9.0 on a shared host server.

I have PHP 5.3.8 with PDO activated however when i'm installing roundcube, this is what response I get:

Check DB config
Fatal error: Undefined class constant 'MYSQL_ATTR_FOUND_ROWS' in /home/neuas/domains/ on line 127

I have contacted my host, they turned me away. I contacted Roundcube, they turned me away. Is there something I could be overlooking?

here is the PDO section of the code including the faulty line:

102    protected function dsn_options($dsn)
103    {
104    $result = array();
106    if (!empty($dsn['key'])) {
107        $result[PDO::MYSQL_ATTR_KEY] = $dsn['key'];
108    }
110    if (!empty($dsn['cipher'])) {
111        $result[PDO::MYSQL_ATTR_CIPHER] = $dsn['cipher'];
112    }
114    if (!empty($dsn['cert'])) {
115        $result[PDO::MYSQL_ATTR_SSL_CERT] = $dsn['cert'];
116    }
118    if (!empty($dsn['capath'])) {
119        $result[PDO::MYSQL_ATTR_SSL_CAPATH] = $dsn['capath'];
120    }
122    if (!empty($dsn['ca'])) {
123        $result[PDO::MYSQL_ATTR_SSL_CA] = $dsn['ca'];
124    }
126    // Always return matching (not affected only) rows count
127    $result[PDO::MYSQL_ATTR_FOUND_ROWS] = true;


I know this is an older topic, but I found it while searching for a solution to the same issue. Here is what worked for me. I opened with a text editor and looked at lines 25-28, then uncommented and edited the line that applied to my installation. That removed the error message and the install completed.

//$rcmail_config['db_dsnw'] = 'mysql://roundcube:pass@localhost/roundcubemail';
// postgres example: 'pgsql://roundcube:pass@localhost/roundcubemail';
// Warning: for SQLite use absolute path in DSN:
// sqlite example: 'sqlite:////full/path/to/sqlite.db?mode=0646';

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