[R] Lattice: no grid name space

[Edzer J. Pebesma]

The following now occurs to me when I try to
load lattice (R 1.7.1, debian stable):

> library(lattice)
Error in loadNamespace(i, c(lib.loc, .libPaths()), keep.source) :
        package `grid' does not have a name space
Error in library(lattice) : package/namespace load failed

I did an update.packages() as root recently.
Any idea what's wrong?
--
Edzer