[R] R CMD check Error: package MASS was built before R 3.0.0 - not true!?

[Dirk Eddelbuettel]

Christian Hennig <ucakche <at> ucl.ac.uk> writes:
> I just updated my R to 3.0.2 and ran
> R CMD check --as-cran on the just produced new version of fpc.
> 
> I got an error
> Error: package "MASS" was built before R 3.0.0: please re-install it
> 
> - but I actually *did* re-install MASS without error just before that and 
> within R library(MASS) works just fine.
> 
> What can I do about this?

Look at .libPaths() and check the directories it lists for a different 
copy of MASS.

Dirk