[Rd] OS_type

[Prof Brian Ripley]

We've now implemented an OS_type field in a package's DESCRIPTION file, 
which if set has to match .Platform$OS.type (possible values "unix" and 
"windows").  CRAN has set up some overrides and added this field to 
packages known to be Unix-only or Windows-only, but authors should do so 
for themselves in future.

Unsuitable packages will not be offered by available.packages(), will not 
be installed by R CMD INSTALL, and R CMD check will select --no-install.

This happens in R-devel and R-patched, and is intended to simplify 
automated installation and checking.


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595