This function works by bundling source package, and then uploading to
http://win-builder.r-project.org/.  Once building is complete you'll
receive a link to the built package in the email address listed in the
maintainer field.  It usually takes around 30 minutes. As a side effect,
win-build also runs R CMD check on the package, so build_win
is also useful to check that your package is ok on windows.
build_win(pkg = ".", version = c("R-release", "R-devel"), args = NULL,
  quiet = FALSE)package description, can be path or package name.  See
as.package for more information
directory to upload to on the win-builder, controlling which version of R is used to build the package. Possible options are listed on http://win-builder.r-project.org/. Defaults to R-devel.
An optional character vector of additional command
line arguments to be passed to R CMD build if binary = FALSE,
or R CMD install if binary = TRUE.
if TRUE suppresses output from this function.
Other build functions: build