Check or set PATH

path.R

# Check your current path
path0 <- Sys.getenv("PATH")
path0

# You need to check the specifics of where Rtools is located on your system
path <- "C:\\Program Files\\R\\R-3.2.3\\bin\\x64;c:\\Rtools32\\bin;c:\\Rtools32\\gcc-4.6.3\\bin;"

# Create a new path
path <- paste0(path,path0,sep=";")

# Set the path
Sys.setenv(PATH=path)

# Check the path again
Sys.getenv("PATH")