[BioC] Warning message while trying to install Bioconductor

[Felix Francis [guest]]

While trying to install Bioconductor, I get this warning message:

installed directory not writable, cannot update packages 'boot', 'class', 'cluster', 'foreign', 'KernSmooth', 'lattice', 'MASS',
  'Matrix', 'mgcv', 'nlme', 'nnet', 'rpart', 'spatial' 

I do have the latest version of R. Please let me know how to resolve this.

Thank you!

 -- output of sessionInfo(): 

> source("http://bioconductor.org/biocLite.R")
Bioconductor version 2.14 (BiocInstaller 1.14.2), ?biocLite for help
> source("http://bioconductor.org/biocLite.R")
Bioconductor version 2.14 (BiocInstaller 1.14.2), ?biocLite for help
> biocLite()
BioC_mirror: http://bioconductor.org
Using Bioconductor version 2.14 (BiocInstaller 1.14.2), R version 3.1.0.
Warning message:
installed directory not writable, cannot update packages 'boot', 'class', 'cluster', 'foreign', 'KernSmooth', 'lattice', 'MASS',
  'Matrix', 'mgcv', 'nlme', 'nnet', 'rpart', 'spatial' 

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