CUPs and libgnutls

[jbarnet]

I'm receiving this error: 
	/libexec/ld-elf.so.1: Shared object "libgnutls.so.13" not found, required by "libcups.so.2"
(Swat (part of samba) is trying to load, and it bombs out).

I installed samba via ports (which cups was either pre-installed or installed via a pre-req of another package)... 
so I'm wondering:

1) why didn't cups install the correct libgnutls version that it needed?
2) how do I find out which pacakge/port the libgnutls.so is part of?

Thanks