MySQL4 isn't in use anymore. You should use resource setup model instead. First you should define resource in config.xml
<config>
<modules>
<SS_Rapt>
<version>0.0.1</version>
</SS_Rapt>
</modules>
<global>
<resources>
<rapt_setup>
<setup>
<module>SS_Rapt</module>
<class>SS_Rapt_Model_Resource_Setup</class>
</setup>
<connection>
<use>core_setup</use>
</connection>
</rapt_setup>
</resources>
</global>
</config>
Then you need to create SS_Rapt_Model_Resource_Setup file in the following location:
SS/Rapt/Model/Resource/Setup.php
This class should contain just this:
<?php
class SS_Rapt_Model_Resource_Setup extends Mage_Eav_Model_Entity_Setup{
}
At the end, you need to create install script in this location: SS/Rapt/sql/rapt_setup/install-0.0.1.php
You don't need to put mysql4 at the beginning of the name of install script. That's it :)