Not sure what the :scheme header argument might be or how to change it.
However, changing the geiser-impl--implementation (changed order to make
sure) and geiser-default-implementation seemed to do the trick. My bad
overlooking this.

Thanks,
LB

On Sat, Aug 29, 2015 at 10:45 PM, Thomas S. Dye <tsd@tsdye.com> wrote:

> Aloha Lawrence,
>
> Lawrence Bottorff <borgauf@gmail.com> writes:
>
> > 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.
>
> Looking at the code, there is a :scheme header argument that can
> indicate what scheme implementation should be used.  Otherwise, it
> appears to use geiser-impl--implementation, which a comment says is
> defined in geiser-impl.el.  There is also geiser-default-implementation
> and geiser-active-implementations from that same source.
>
> hth,
> Tom
>
> --
> Thomas S. Dye
> http://www.tsdye.com
>