If look at the package source how could I tell if the package supports this
behavior?

On Fri, Jan 25, 2002 at 01:44:26PM +0100, Ignatios Souvatzis wrote:
> On Thu, Jan 24, 2002 at 05:39:27PM -0500, Wayne Cuddy wrote:
> > I see in the Readme that a 'make update' should upgrade my installed package
> > but will in turn perform a pkg_delete followed by a pkg_add.  Does this mean
> > that configuration files that I have modified will be destroyed?
> 
> Depends on the package. Some are wise enough to leave configuration
> files alone when pkg_deleteing and when pkg_adding.
> 	
> 	-is