Bug#878983:

[Andy Li <andy@onthewings.net>]

For the record, I've briefly looked into this.
The initially reported build error can be fixed by applying
https://gitlab.math.univ-paris-diderot.fr/cduce/cduce/commit/020feca404095bcc08ebfa6deebaecbbc7399852.
There are, however, some other build errors due to the reference to
OCaml source files in Makefile.
The upstream cduce-next branch can be built with Debian's OCaml 4.05.
I've asked upstream (Giuseppe Castagna) to make a new release and I
was told that they will do it soon.

Best,
Andy