Hello,

I have a question I feel is very basic but I did not find the answer in
the manual. How can I trigger the tangling of a block upon export.

More precisely, I want to give the following example in a lecture:

#+name:hello
#+begin_src ocaml :tangle myprog.ml
Printf.printf "Bonjour le monde !\n"
#+end_src

#+BEGIN_SRC sh :exports both :results verbatim
ocamlc -o myprog myprog.ml
./myprog
#+END_SRC

where I show a program to be compiled and actually compile it. Is there
a header I should put on the "hello" block to tangle it when I export
it?

Thanks,

Alan

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