[BioC] biocLite() partial install of pakcages issue

[km]

Hi all,

I notice that when  I install bioconductor, biocLite() call fails  to
fetch some packages. But it installs some packages at the end of the
installation.
Now if I run biocLite() again, I expect it to skip installed pakages
and retry fetching those packages not installed.
Surprisingly, biocLite() fetches  starts the process of installing all
packages, even if installed, serially and attempts to install them.
Is there a  way to just make it just install those packages skipped
during previous install ?

regards,
KM