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# require outside the package so that its functions are 
# NOT imported into the UtilLib namespace, so that other
...
require mysql_wrapper_lib.pl;

package UtilLib;

# File mysql_wrapper_lib.pl
$foo = 123;
1;

package One;
use UtilLib;

package Two;
use UtilLib;

# File Mysql_wrapper.pm
package Mysql_wrapper;
...

$foo = 123;
1;

package One;
use Mysql_wrapper;

package Two;
use Mysql_wrapper;

package Mysql_wrapper;
$foo = 123;
...
   # and the same for other variables...
}
1;