* example
  :PROPERTIES:
  :tangle:   yes
  :comments: link
  :END:

The required headers.
#+name: header
#+begin_src C
  #include <stdio.h>
#+end_src

Here is the auxiliary function.
#+name: auxiliary
#+begin_src C
  void aux(char* arg){
    printf("first argument: %s\n", arg);
  }
#+end_src

Here is the main function.
#+name: main
#+begin_src C
  int main(int argc, char *argv[])
  {
    aux(argv[1]);
    return 0;
  }
#+end_src