The last update was in 2014 (9.2), but a major
release came out since (10.x).
See discussion at https://discourse.nixos.org/t/6776
but to sum up:
The portable C source and Windows binaries are not
available in the latest MIT Scheme release
(see https://www.gnu.org/software/mit-scheme/release.html )
Warning: Locale seems not configured
hence the option to build from source has been
removed from `default.nix`. Although there is a
source package included in the release (in lieu of
the portable C source), there is a caveat:
> Note that you cannot build a working system from the
> source unless you have a working MIT/GNU Scheme
> compiler to do the compilation. (This doesn't apply
> to the portable C source, which requires only a C
> compiler.) This means that if the above binaries
> don't work on your system, it is pointless to try
> building a custom set of binaries from the source
> code.
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