Two versions of ruby == problem?

[Roger Merritt]

After doing a cvsup on one of my machines I like to run 'portversion -c > 
needs.update' to see what needs updating. If the output is small enough I 
might try doing 'portupgrade -a', but usually I go through the list one by 
one to set the flags I think portupgrade will need for that case. This time 
I was a little surprised to find two entries for ruby:

#
#  ruby
#  needs updating (port has 1.6.8.2004.07.28_1)
#
pkgs="$pkgs ruby-1.6.8.2004.07.28"

#
#  ruby
#  needs updating (port has 1.8.2.p2_2)
#
pkgs="$pkgs ruby-1.8.2.p2_1"

I don't know how I got two versions installed, but more importantly I 
wonder if this is a problem? Should I deinstall one or the other? Or should 
I deinstall both and reinstall one (I suppose 1.8.2.p2_2 is the most 
recent)? Or should I just go ahead and upgrade both?

Any recommendations would be gratefully received.

-- 
Roger