libghc-x11-doc 1.8-2 (amd64 binary) in ubuntu bionic

 This library is a binding to the X11 graphics library.
 The binding is a direct translation of the C binding; for
 documentation of these calls, refer to "The Xlib Programming
 Manual", available online at <http://tronche.com/gui/x/xlib/>.
 .
 This package provides the documentation for a library for the Haskell
 programming language.
 See http://www.haskell.org/ for more information on Haskell.