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diff --git a/lisp/term/haiku-win.el b/lisp/term/haiku-win.el
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+;;; haiku-win.el --- set up windowing on Haiku -*- lexical-binding: t -*-
+
+;; Copyright (C) 2021 Free Software Foundation, Inc.
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Support for using Haiku's BeOS derived windowing system.
+
+;;; Code:
+
+(eval-when-compile (require 'cl-lib))
+(unless (featurep 'haiku)
+  (error "%s: Loading haiku-win without having Haiku"
+         invocation-name))
+
+;; Documentation-purposes only: actually loaded in loadup.el.
+(require 'frame)
+(require 'mouse)
+(require 'scroll-bar)
+(require 'menu-bar)
+(require 'fontset)
+(require 'dnd)
+
+(add-to-list 'display-format-alist '(".*" . haiku-win))
+
+;;;; Command line argument handling.
+
+(defvar x-invocation-args)
+(defvar x-command-line-resources)
+
+(defvar haiku-initialized)
+
+(declare-function x-open-connection "haikufns.c")
+(declare-function x-handle-args "common-win")
+(declare-function haiku-selection-data "haikuselect.c")
+(declare-function haiku-selection-put "haikuselect.c")
+(declare-function haiku-selection-targets "haikuselect.c")
+(declare-function haiku-put-resource "haikufns.c")
+
+(defun haiku--handle-x-command-line-resources (command-line-resources)
+  "Handle command line X resources specified with the option `-xrm'.
+The resources should be a list of strings in COMMAND-LINE-RESOURCES."
+  (dolist (s command-line-resources)
+    (let ((components (split-string s ":")))
+      (when (car components)
+        (haiku-put-resource (car components)
+                            (string-trim-left
+                             (mapconcat #'identity (cdr components) ":")))))))
+
+(cl-defmethod window-system-initialization (&context (window-system haiku)
+                                                     &optional display)
+  "Set up the window system.  WINDOW-SYSTEM must be HAIKU.
+DISPLAY may be set to the name of a display that will be initialized."
+  (cl-assert (not haiku-initialized))
+
+  (create-default-fontset)
+  (when x-command-line-resources
+    (haiku--handle-x-command-line-resources
+     (split-string x-command-line-resources "\n")))
+  (x-open-connection (or display "be") x-command-line-resources t)
+  (setq haiku-initialized t))
+
+(cl-defmethod frame-creation-function (params &context (window-system haiku))
+  (x-create-frame-with-faces params))
+
+(cl-defmethod handle-args-function (args &context (window-system haiku))
+  (x-handle-args args))
+
+(defun haiku--selection-type-to-mime (type)
+  "Convert symbolic selection type TYPE to its MIME equivalent.
+If TYPE is nil, return \"text/plain\"."
+  (cond
+   ((memq type '(TEXT COMPOUND_TEXT STRING UTF8_STRING)) "text/plain")
+   ((stringp type) type)
+   ((symbolp type) (symbol-name type))
+   (t "text/plain")))
+
+(cl-defmethod gui-backend-get-selection (type data-type
+                                              &context (window-system haiku))
+  (if (eq data-type 'TARGETS)
+      (apply #'vector (mapcar #'intern
+                              (haiku-selection-targets type)))
+    (haiku-selection-data type (haiku--selection-type-to-mime data-type))))
+
+(cl-defmethod gui-backend-set-selection (type value
+                                              &context (window-system haiku))
+  (haiku-selection-put type "text/plain" value t))
+
+(cl-defmethod gui-backend-selection-exists-p (selection
+                                              &context (window-system haiku))
+  (haiku-selection-data selection "text/plain"))
+
+(cl-defmethod gui-backend-selection-owner-p (_
+                                             &context (window-system haiku))
+  t)
+
+(declare-function haiku-read-file-name "haikufns.c")
+
+(defun x-file-dialog (prompt dir default_filename mustmatch only_dir_p)
+  "SKIP: real doc in xfns.c."
+  (if (eq (framep-on-display (selected-frame)) 'haiku)
+      (haiku-read-file-name prompt (selected-frame)
+                            (or dir (and default_filename
+                                         (file-name-directory default_filename)))
+                            mustmatch only_dir_p
+                            (file-name-nondirectory default_filename))
+    (error "x-file-dialog on a tty frame")))
+
+(defun haiku-dnd-handle-drag-n-drop-event (event)
+  "Handle specified drag-n-drop EVENT."
+  (interactive "e")
+  (let* ((string (caddr event))
+	 (window (posn-window (event-start event))))
+    (with-selected-window window
+      (raise-frame)
+      (dnd-handle-one-url window 'private (concat "file:" string)))))
+
+(define-key special-event-map [drag-n-drop]
+            'haiku-dnd-handle-drag-n-drop-event)
+
+(provide 'haiku-win)
+(provide 'term/haiku-win)
+
+;;; haiku-win.el ends here