improvements

make.sh

@@ -11,7 +11,7 @@ case $1 in
         ;;
     build)
         if ! command -v tup >/dev/null; then
-            echo Error: You need tup installed to build: http://gittup.org/tup/
+            echo Error: You need tup installed to build: http://gittup.org/tup/ >&2
             exit 1
         fi
         tup init 2>/dev/null