[Rd] configure fail for XML package on freebsd

[Robert Hijmans]

I would like to write an S4 generic for 'median', but I am not sure
how to do this properly as the function does not have a "..." argument

I can do this

setGeneric("median", function(x, na.rm=FALSE)
	standardGeneric("median"))

but I want to be able to pass it a number of objects of the same
class, so I need a ... argument; or use signature='list' which is not
very useful.

I can do this:

setGeneric("median", function(x, ..., na.rm=FALSE)
	standardGeneric("median"))

and

setMethod('median', signature(x='ANY'),
function(x, ..., na.rm=FALSE){ x <- c(x, ...)
return(stats::median(x, na.rm=na.rm))
#	}
#)

setMethod("median", signature(x='Raster'),
	function(x, ..., na.rm=FALSE){

#		rasters <- list(...)