There's a merged pull request on the void-packages repository

giac: makedepend on mpfr-devel and pari-devel
https://github.com/void-linux/void-packages/pull/29141

Description:
 - mpfr is used for arbitrary precision floats, otherwise they are
   limited to double precision (53 bits ~ 13 digits)

 - pari is used for number theory functions

In addition to the two new makedepends, there is a small patch that
fixes one line of test output to match a change in pari.

With this commit, make check goes from 12 tests failed to 1 test failed.

See #28989.