This is a experimental build of R for 64-bit Windows using the
MinGW-w64 toolchain.

Please consult the R-admin manual in the R-devel sources (or in
doc/manual after unpacking) for notes on use.

Daily snapshots are available from 
http://cran.r-project.org/bin/windows64/base/
and mirrors.

Some software to help build packages is available from
http://www.stats.ox.ac.uk/pub/Rtools/goodies/Win64/