[Rd] CRAN build/checks: Dependencies on non-CRAN packages?

[Henrik Bengtsson]

Hi,

how is the CRAN build/check system dealing with dependencies on
non-CRAN packages?  Are there external repositories that are dealt
with in special ways, e.g. Bioconductor and Omegahat?  Is this
documented somewhere?

The most recent note on this that I could locate is "[Rd] CRAN,
Bioconductor and ctv package dependency questions", Kurt Hornik, Sept
8, 2005; https://stat.ethz.ch/pipermail/r-devel/2005-September/034547.html.
 Does the comments in that thread still reflect how CRAN works?

Thanks

Henrik