variants question

[belinda thom]

Hi,

One final question: how does port handle the case where you've  
already installed something (e.g. subversion) and you then want to  
"add on" a variant (e.g. +tools)? Does it do a completely new  
reinstall, or does it piggy-back off of existing things when it can?  
Is it standard practice to clean out the existing (via port ...  
clean) before adding the new variant?

Thanks,

--b