libghc-unix-compat-doc 0.4.3.1-1 (arm64 binary) in ubuntu bionic

 This package provides portable Haskell implementations of some POSIX
 system calls contained in the unix package. This package re-exports the
 unix package when available. When it isn't available, portable
 implementations are used.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.