More work on call tag.

compile

@@ -5,7 +5,7 @@ do
    filename="${file%.*}"
    list="$list $filename.o"
    echo -n "Compiling $filename..."
-   g++ -g -c -std=c++17 -I../CoreUtils $file &
+   g++ -g -c -std=c++23 -I../CoreUtils $file &
    if [ $? = '0' ]
    then
     echo "OK"
@@ -18,7 +18,7 @@ done
 
 wait
 echo -n "Building executable testjet..."
-g++ -g -o testjet $list -std=c++17 -L../CoreUtils -lCoreUtils
+g++ -g -o testjet $list -std=c++23 -L../CoreUtils -lCoreUtils
 if [ $? = '0' ]
 then
  echo "OK"