The devel/libffi port

libffi-3.3 – Foreign Function Interface (cvsweb github)

Description

FFI stands for Foreign Function Interface. A foreign function interface
is the popular name for the interface that allows code written in one
language to call code written in another language. The libffi library
really only provides the lowest, machine dependent layer of a fully
featured foreign function interface. A layer must exist above libffi
that handles type conversions for values passed between the two
languages.

WWW: https://sourceware.org/libffi/