Set babel scheme to chicken?

[Lawrence Bottorff <borgauf@gmail.com>]

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I have a few schemes installed on my computer (MIT, guile, chicken), but
when I run such code as this

#+BEGIN_SRC scheme :session one
(define (myadd x y)
   (+ x y))
#+END_SRC

it works -- beautifully with multiple REPLs (as you name them in the
:session) -- but it always grabs the guile. I'd like it to use chicken
instead -- or maybe later MIT. I've got latest geiser installed as well
that should handle chicken. How can I use chicken inside of orgmode scheme
code blocks? Wild guess, guile is first on some list, i.e., path? babel
customize didn't seem to have an entry for which flavor.

LB

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