Meld has come a long way, baby - it pays to use the latest version.
First, un-install the old version from your distro, then do this:
I put stuff like this into my ~/bin folder, so:
git clone http://git.gnome.org/browse/meld
then to run it, just do:
to make it system wide and respond to
meld, do this:
sudo ln -s ~/bin/meld/bin/meld meld
Now you can just run
meld anywhere and it'll run.
To update to the latest version and start using it, just do: