(define-external (svn_ls_add2 (int a) (int b) (int c) (int d) (int e) (int f))
  int
  (print "hoi from bla_bla")
  (+ a b c d e f))

(define-external (svn_ls_add3 (int a) (int b) (int c) (int d) (int e) (int f))
  int
  (print "hoi")
  (+ 1 2))