libbase-ocaml binary package in Ubuntu Focal s390x

 Base is a standard library for OCaml. It provides a standard set of
 general purpose modules that are well-tested, performant, and
 fully-portable across any environment that can run OCaml code. Unlike
 other standard library projects, Base is meant to be used as a
 wholesale replacement of the standard library distributed with the
 OCaml compiler. In particular it makes different choices and doesn’t
 re-export features that are not fully portable such as I/O, which are
 left to other libraries.
 .
 This package contains runtime files.

Source package