Hi,
not quite an issue concerning this repo, but: The file octave_support.h is missing in the other official source for release tarballs, linked from the Uni of Pisa under https://numpi.dm.unipi.it/_media/software/mpsolve/mpsolve-3.2.1.tar.bz2.
This breaks compilation of the octave bindings. The upstream version of the file works as expected.
Other silent differences that don't break compilation: some examples (not sure if that's intended; probably not, as other examples are included) and some test polynomials (probably intended, as those are the huge ones).