[R] Using library in an example

[Jim Lemon]

Hi all,
I've been trying to include a nice example in the Rd file for a function 
and cannot work out how to get it through R check. If I use:

if(require(maps,quietly=TRUE)) {
  ...

Warning message:
'Sys.putenv' is deprecated.
Use 'Sys.setenv' instead.
See help("Deprecated")

The warning message causes R check to get the tremors and assume there 
is something wrong with the example. This also means that I can't put a 
little message telling the user that they needed "maps" to run the 
example, as the warning message leads to the "else" being detached from 
the "if" (and another tremor and error message).

I can't really use the following, even though it doesn't cause the 
warning (but would be messy if the user didn't have the package).

if(library(maps)) {
  ...

If I try:

if(library(maps,logical.return=TRUE)) {
  ...

I get the same warning as with "require". Does this qualify as a bug in 
require/library or should I just not bother to test the result of 
"library" and let the user suffer?

Jim