Rinstall

dotR <- file.path(Sys.getenv("HOME"), ".R")
if (!file.exists(dotR))
  dir.create(dotR)
M <- file.path(dotR, "Makevars.win")
if (!file.exists(M))
  file.create(M)
cat("\nCXX14FLAGS=-O3 -Wno-unused-variable -Wno-unused-function",
    "CXX14 = $(BINPREF)g++ -m$(WIN) -std=c++1y",
    "CXX11FLAGS=-O3 -Wno-unused-variable -Wno-unused-function",
    file = M, sep = "\n", append = TRUE)