diff --git a/Modules/makesetup b/Modules/makesetup
index 8767662..4ab84c2 100755
--- a/Modules/makesetup
+++ b/Modules/makesetup
@@ -140,6 +140,8 @@
 			*.[cC])		srcs="$srcs $arg";;
 			*.cc)		srcs="$srcs $arg";;
 			*.c++)		srcs="$srcs $arg";;
+			*.cxx)		srcs="$srcs $arg";;
+			*.cpp)		srcs="$srcs $arg";;
 			\$*)		libs="$libs $arg"
 					cpps="$cpps $arg";;
 			*.*)		echo 1>&2 "bad word $arg in $line"