diff -Nru orig/R3CPET/src/Makevars.win patched/R3CPET/src/Makevars.win
--- orig/R3CPET/src/Makevars.win	2023-10-20 20:25:11.000000000 +0200
+++ patched/R3CPET/src/Makevars.win	2024-03-16 12:01:51.869095900 +0100
@@ -1,3 +1,3 @@
-
+CXX_STD = CXX14
 ## Use the R_HOME indirection to support installations of multiple R version
 PKG_LIBS = $(shell "${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" -e "Rcpp:::LdFlags()")