I am trying to check and build a package that requires another package 
that generates a warning, so the check step never really completes with no 
warnings.

The package uses some routines in the lubridate package, but when the 
lubridate package is loaded for the check, I get these warnings:

Found the following significant warnings:
  Warning: changing locked binding for '+.Date' in 'base' whilst loading 
'lubridate'
  Warning: changing locked binding for '+.POSIXt' in 'base' whilst loading 
'lubridate'
  Warning: changing locked binding for '-.Date' in 'base' whilst loading 
'lubridate'
  Warning: changing locked binding for '-.POSIXt' in 'base' whilst loading 
'lubridate'
  Warning: changing locked binding for '/.difftime' in 'base' whilst 
loading 'lubridate'

Everything else now checks out OK.

Is this a big issue?
Can I avoid the error by specifically referring to the functions that I 
need instead of loading the library?
Does the last one cahnge what is specified in the DESCRIPTION file?

Thanks.
Dave

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