Updating Ports

[Cody Holland]

After running cvsup, I then ran portdb -Uu and received the following
error.

Updating the ports index ... Generating INDEX.tmp - please
wait..gnustep-slideshow-0.3: "/usr/ports/graphics/slideshowkit"
non-existent -- dependency list incomplete
===> graphics/gnustep-slideshow failed
*** Error code 1
1 error

*** Error code 1

Stop in /usr/ports.
*** Error code 1

Stop in /usr/ports.
failed to generate INDEX!
portsdb: index generation error

How do I fix this?