Develop for Hive14 on SP 2013

Hi,

I want to write a Farm-Solution for the Hive 14 (SP 2010 Mode) on SharePoint Server 2013.

When I use VS 2012 and create a SP 2013 Solution and try to deploy it on a Hive 14 Site-Collection I always get errors when I activate the feature. I also want to debug the solution out of VS.

How can manage that ?

Thanks

Stephan