Help with Makefile CONFLICTS PARAMETER

[Fbsd8]

I added this to my port Makefile for portname-3.2

CONFLICTS portname-1.* portname-2.* portname-3.[0-1]

Now I want to display a message block with instructions on how to handle 
the conflicts. Is there a post-conflicts target or some other target 
that gets processed around the conflicts process time that I can use to 
display messages to the user?

Thanks for your help.