No, no configuration file, your system will execute whichever perl version it encounters first in your path (or the one you explicitly specify). Check your $PATH with

, if /usr/local/bin appears before /usr/bin you can get away with creating a symlink from /usr/local/bin/perl to your new perl executable. That way you can call the new version with perl or /usr/local/bin/perl or call the older version with /usr/bin/perl. You may get confusing behaviour if you do that though, because scripts and/or libraries may call a different version of perl than you're expecting.