Xorg errs after updating ports

[Lowell Gilbert]

Quoting from /usr/ports/UPDATING (which may itself have been updated
after you did your ports download, so you may not yet have this advice
on your hard disk):

  Users of nvidia-driver will have to make sure Composite extension is
  turned off and start Xorg with the following command:

  $ startx -- -ignoreABI

  The -ignoreABI option is a Xorg option. If you're using gdm, kdm or
  xdm, you will have to modify your configuration file so that Xorg
  starts with this option.

  An updated nvidia-driver should be released soon.