Bug#885212: libmatheval: please migrate to guile-2.2

[Rob Browning]

I think we probaly either need to address this soon, or consider
removing libmatheval from Debian.

Sometimes it's sufficient to just update the build dependency from say
guile-2.0-dev to guile-3.0-dev and adjust some of the related versions
in configure.ac (or configure.in), but in this case it looks like more
might be required.

When I make those adjutments to 3.0 with the current package I see some
SCM related type errors which I suspect are problems with the
types/prototypes in the library, i.e. int is (and was) not
(transparently) interchangable with SCM.

I may investigate further myself if I have time, but please don't rely
on that.

Thanks
-- 
Rob Browning
rlb @defaultvalue.org and @debian.org
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