From e83d1fe87564d06d2fcbb4006dfd9133bc340aa8 Mon Sep 17 00:00:00 2001
From: Dan Nicolaescu <dann@ics.uci.edu>
Date: Fri, 9 Nov 2007 05:20:57 +0000
Subject: [PATCH] * ediff-init.el (ediff-xemacs-p, ediff-emacs-p): Remove.
 (ediff-has-face-support-p, ediff-BAD-INFO, ediff-check-version)
 (ediff-current-diff-A, ediff-current-diff-B) (ediff-current-diff-C,
 ediff-fine-diff-C, ediff-fine-diff-A) (ediff-fine-diff-B,
 ediff-fine-diff-Ancestor, ediff-even-diff-A) (ediff-even-diff-B,
 ediff-even-diff-C, ediff-even-diff-Ancestor) (ediff-odd-diff-A,
 ediff-odd-diff-B, ediff-odd-diff-C) (ediff-odd-diff-Ancestor,
 ediff-reset-mouse): * ediff-wind.el
 (ediff-narrow-control-frame-leftward-shift) (ediff-setup-windows-plain-merge)
 (ediff-setup-windows-plain-compare, ediff-setup-control-frame)
 (ediff-refresh-control-frame, ediff-get-visible-buffer-window): *
 ediff-util.el (ediff-setup-keymap, ) (ediff-toggle-wide-display,
 ediff-toggle-multiframe) (ediff-toggle-use-toolbar, ediff-really-quit)
 (ediff-good-frame-under-mouse) (ediff-highlight-diff-in-one-buffer)
 (ediff-remove-flags-from-buffer, ediff-place-flags-in-buffer1)
 (ediff-make-bullet-proof-overlay): * ediff-mult.el (ediff-setup-meta-map,
 ediff-emacs-p) (ediff-set-meta-overlay): * ediff-help.el
 (ediff-help-region-map, ediff-set-help-overlays): * ediff.el
 (ediff-documentation): Replace ediff-xemacs-p and ediff-emacs-p with their
 former definitions.

* emulation/viper-init.el (viper-xemacs-p, viper-emacs-p): Remove.
(viper-has-face-support-p, viper-inactivate-input-method)
(viper-activate-input-method)
(viper-use-replace-region-delimiters, viper-restore-cursor-type):
* emulation/viper-mous.el (viper-multiclick-timeout)
(viper-surrounding-word, viper-mouse-click-insert-word)
(viper-mouse-click-search-word, viper-parse-mouse-key):
* emulation/viper-macs.el (viper-char-array-to-macro):
* emulation/viper.el (viper-go-away, viper-set-hooks)
(viper-non-hook-settings):
* emulation/viper-util.el (viper-get-saved-cursor-color-in-replace-mode)
(viper-get-saved-cursor-color-in-insert-mode)
(viper-get-saved-cursor-color-in-emacs-mode)
(viper-check-version, viper-get-visible-buffer-window)
(viper-file-checked-in-p, viper-set-replace-overlay)
(viper-set-replace-overlay-glyphs, viper-set-minibuffer-overlay)
(viper-check-minibuffer-overlay, viper-read-key-sequence)
(viper-key-to-emacs-key): Replace viper-xemacs-p and viper-emacs-p
with their former definitions.
(viper-eventify-list-xemacs): Only do work for XEmacs.
(viper-set-unread-command-events): Only do work for Emacs.
(viper-overlay-p, viper-make-overlay, viper-overlay-live-p)
(viper-move-overlay, viper-overlay-start, viper-overlay-end)
(viper-overlay-get, viper-overlay-put, viper-read-event)
(viper-characterp, viper-int-to-char, viper-get-face)
(viper-color-defined-p, viper-iconify): New defaliases replacing
the old fsets.

* progmodes/fortran.el (comment-region-function)
(uncomment-region-function): Pacify byte compiler.

* vc.el (vc-diff-internal): Remove code for an old version of
gnus.
---
 lisp/ChangeLog               |  61 +++++++++++++++++++++
 lisp/ediff-help.el           |   4 +-
 lisp/ediff-init.el           |  57 +++++++++-----------
 lisp/ediff-mult.el           |   6 +--
 lisp/ediff-util.el           |  37 +++++++------
 lisp/ediff-wind.el           |  17 +++---
 lisp/ediff.el                |   2 +-
 lisp/emulation/viper-cmd.el  |  22 ++++----
 lisp/emulation/viper-ex.el   |   8 +--
 lisp/emulation/viper-init.el |  20 +++----
 lisp/emulation/viper-macs.el |   2 +-
 lisp/emulation/viper-mous.el |  28 +++++-----
 lisp/emulation/viper-util.el | 126 ++++++++++++++++++++-----------------------
 lisp/emulation/viper.el      |  26 ++++-----
 lisp/progmodes/fortran.el    |   3 +-
 lisp/vc.el                   |   4 +-
 16 files changed, 230 insertions(+), 193 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d61d09008fb..bac3ee7a691 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,64 @@
+2007-11-09  Dan Nicolaescu  <dann@ics.uci.edu>
+
+	* ediff-init.el (ediff-xemacs-p, ediff-emacs-p): Remove.
+	(ediff-has-face-support-p, ediff-BAD-INFO, ediff-check-version)
+	(ediff-current-diff-A, ediff-current-diff-B)
+	(ediff-current-diff-C, ediff-fine-diff-C, ediff-fine-diff-A)
+	(ediff-fine-diff-B, ediff-fine-diff-Ancestor, ediff-even-diff-A)
+	(ediff-even-diff-B, ediff-even-diff-C, ediff-even-diff-Ancestor)
+	(ediff-odd-diff-A, ediff-odd-diff-B, ediff-odd-diff-C)
+	(ediff-odd-diff-Ancestor, ediff-reset-mouse):
+	* ediff-wind.el (ediff-narrow-control-frame-leftward-shift)
+	(ediff-setup-windows-plain-merge)
+	(ediff-setup-windows-plain-compare, ediff-setup-control-frame)
+	(ediff-refresh-control-frame, ediff-get-visible-buffer-window):
+	* ediff-util.el (ediff-setup-keymap, )
+	(ediff-toggle-wide-display, ediff-toggle-multiframe)
+	(ediff-toggle-use-toolbar, ediff-really-quit)
+	(ediff-good-frame-under-mouse)
+	(ediff-highlight-diff-in-one-buffer)
+	(ediff-remove-flags-from-buffer, ediff-place-flags-in-buffer1)
+	(ediff-make-bullet-proof-overlay):
+	* ediff-mult.el (ediff-setup-meta-map, ediff-emacs-p)
+	(ediff-set-meta-overlay):
+	* ediff-help.el (ediff-help-region-map, ediff-set-help-overlays):
+	* ediff.el (ediff-documentation): Replace ediff-xemacs-p and
+	ediff-emacs-p with their former definitions.
+
+	* emulation/viper-init.el (viper-xemacs-p, viper-emacs-p): Remove.
+	(viper-has-face-support-p, viper-inactivate-input-method)
+	(viper-activate-input-method)
+	(viper-use-replace-region-delimiters, viper-restore-cursor-type):
+	* emulation/viper-mous.el (viper-multiclick-timeout)
+	(viper-surrounding-word, viper-mouse-click-insert-word)
+	(viper-mouse-click-search-word, viper-parse-mouse-key):
+	* emulation/viper-macs.el (viper-char-array-to-macro):
+	* emulation/viper.el (viper-go-away, viper-set-hooks)
+	(viper-non-hook-settings):
+	* emulation/viper-util.el (viper-get-saved-cursor-color-in-replace-mode)
+	(viper-get-saved-cursor-color-in-insert-mode)
+	(viper-get-saved-cursor-color-in-emacs-mode)
+	(viper-check-version, viper-get-visible-buffer-window)
+	(viper-file-checked-in-p, viper-set-replace-overlay)
+	(viper-set-replace-overlay-glyphs, viper-set-minibuffer-overlay)
+	(viper-check-minibuffer-overlay, viper-read-key-sequence)
+	(viper-key-to-emacs-key): Replace viper-xemacs-p and viper-emacs-p
+	with their former definitions.
+	(viper-eventify-list-xemacs): Only do work for XEmacs.
+	(viper-set-unread-command-events): Only do work for Emacs.
+	(viper-overlay-p, viper-make-overlay, viper-overlay-live-p)
+	(viper-move-overlay, viper-overlay-start, viper-overlay-end)
+	(viper-overlay-get, viper-overlay-put, viper-read-event)
+	(viper-characterp, viper-int-to-char, viper-get-face)
+	(viper-color-defined-p, viper-iconify): New defaliases replacing
+	the old fsets.
+
+	* progmodes/fortran.el (comment-region-function)
+	(uncomment-region-function): Pacify byte compiler.
+
+	* vc.el (vc-diff-internal): Remove code for an old version of
+	gnus.
+
 2007-11-08  Michael Albinus  <michael.albinus@gmx.de>
 
 	* net/tramp.el (tramp-maybe-open-connection): Use a local copy of
diff --git a/lisp/ediff-help.el b/lisp/ediff-help.el
index 1c7a72870fe..0c37be31372 100644
--- a/lisp/ediff-help.el
+++ b/lisp/ediff-help.el
@@ -165,7 +165,7 @@ the value of this variable and the variables `ediff-help-message-*' in
 
 (define-key
   ediff-help-region-map
-  (if ediff-emacs-p [mouse-2] [button2])
+  (if (featurep 'emacs) [mouse-2] [button2])
   'ediff-help-for-quick-help)
 
 ;; runs in the control buffer
@@ -177,7 +177,7 @@ the value of this variable and the variables `ediff-help-message-*' in
 	    end (match-end 0)
 	    cmd (buffer-substring (match-beginning 1) (match-end 1)))
       (setq overl (ediff-make-overlay beg end))
-      (if ediff-emacs-p
+      (if (featurep 'emacs)
 	  (ediff-overlay-put overl 'mouse-face 'highlight)
 	(ediff-overlay-put overl 'highlight t))
       (ediff-overlay-put overl 'ediff-help-info cmd))))
diff --git a/lisp/ediff-init.el b/lisp/ediff-init.el
index 21e6bf660ee..dd69b52b022 100644
--- a/lisp/ediff-init.el
+++ b/lisp/ediff-init.el
@@ -43,11 +43,6 @@
 	 (load "ange-ftp" 'noerror)))
 ;; end pacifier
 
-;; Is it XEmacs?
-(defconst ediff-xemacs-p (featurep 'xemacs))
-;; Is it Emacs?
-(defconst ediff-emacs-p (not ediff-xemacs-p))
-
 ;; This is used to avoid compilation warnings. When emacs/xemacs forms can
 ;; generate compile time warnings, we use this macro.
 ;; In this case, the macro will expand into the form that is appropriate to the
@@ -78,8 +73,8 @@ that Ediff doesn't know about.")
   (cond ((ediff-window-display-p))
 	(ediff-force-faces)
 	((ediff-color-display-p))
-	(ediff-emacs-p (memq (ediff-device-type) '(pc)))
-	(ediff-xemacs-p (memq (ediff-device-type) '(tty pc)))
+	((featurep 'emacs) (memq (ediff-device-type) '(pc)))
+	((featurep 'xemacs) (memq (ediff-device-type) '(tty pc)))
 	))
 
 ;; toolbar support for emacs hasn't been implemented in ediff
@@ -506,7 +501,7 @@ set local variables that determine how the display looks like."
 *** of %sEmacs, does not seem to be properly installed.
 ***
 *** Please contact your system administrator. "
-				 (if ediff-xemacs-p "X" "")))
+				 (if (featurep 'xemacs) "X" "")))
 
 ;; Selective browsing
 
@@ -785,8 +780,8 @@ to temp files when Ediff needs to find fine differences."
 ;; testing for sufficiently high Emacs versions.
 (defun ediff-check-version (op major minor &optional type-of-emacs)
   (if (and (boundp 'emacs-major-version) (boundp 'emacs-minor-version))
-      (and (cond ((eq type-of-emacs 'xemacs) ediff-xemacs-p)
-		 ((eq type-of-emacs 'emacs) ediff-emacs-p)
+      (and (cond ((eq type-of-emacs 'xemacs) (featurep 'xemacs))
+		 ((eq type-of-emacs 'emacs) (featurep 'emacs))
 		 (t t))
 	   (cond ((eq op '=) (and (= emacs-minor-version minor)
 				  (= emacs-major-version major)))
@@ -908,7 +903,7 @@ to temp files when Ediff needs to find fine differences."
 
 
 (defface ediff-current-diff-A
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "firebrick" :background "pale green"))
 	(((class color))
@@ -929,7 +924,7 @@ this variable represents.")
 (ediff-hide-face ediff-current-diff-face-A)
 ;; Until custom.el for XEmacs starts supporting :inverse-video we do this.
 ;; This means that some user customization may be trashed.
-(if (and ediff-xemacs-p
+(if (and (featurep 'xemacs)
 	 (ediff-has-face-support-p)
 	 (not (ediff-color-display-p)))
     (copy-face 'modeline ediff-current-diff-face-A))
@@ -937,7 +932,7 @@ this variable represents.")
 
 
 (defface ediff-current-diff-B
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "DarkOrchid" :background "Yellow"))
 	(((class color))
@@ -960,14 +955,14 @@ this variable represents.")
 (ediff-hide-face ediff-current-diff-face-B)
 ;; Until custom.el for XEmacs starts supporting :inverse-video we do this.
 ;; This means that some user customization may be trashed.
-(if (and ediff-xemacs-p
+(if (and (featurep 'xemacs)
 	 (ediff-has-face-support-p)
 	 (not (ediff-color-display-p)))
     (copy-face 'modeline ediff-current-diff-face-B))
 
 
 (defface ediff-current-diff-C
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "Navy" :background "Pink"))
 	(((class color))
@@ -988,14 +983,14 @@ this variable represents.")
 (ediff-hide-face ediff-current-diff-face-C)
 ;; Until custom.el for XEmacs starts supporting :inverse-video we do this.
 ;; This means that some user customization may be trashed.
-(if (and ediff-xemacs-p
+(if (and (featurep 'xemacs)
 	 (ediff-has-face-support-p)
 	 (not (ediff-color-display-p)))
     (copy-face 'modeline ediff-current-diff-face-C))
 
 
 (defface ediff-current-diff-Ancestor
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "Black" :background "VioletRed"))
 	(((class color))
@@ -1016,14 +1011,14 @@ this variable represents.")
 (ediff-hide-face ediff-current-diff-face-Ancestor)
 ;; Until custom.el for XEmacs starts supporting :inverse-video we do this.
 ;; This means that some user customization may be trashed.
-(if (and ediff-xemacs-p
+(if (and (featurep 'xemacs)
 	 (ediff-has-face-support-p)
 	 (not (ediff-color-display-p)))
     (copy-face 'modeline ediff-current-diff-face-Ancestor))
 
 
 (defface ediff-fine-diff-A
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "Navy" :background "sky blue"))
 	(((class color))
@@ -1044,7 +1039,7 @@ this variable represents.")
 (ediff-hide-face ediff-fine-diff-face-A)
 
 (defface ediff-fine-diff-B
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "Black" :background "cyan"))
 	(((class color))
@@ -1065,7 +1060,7 @@ this variable represents.")
 (ediff-hide-face ediff-fine-diff-face-B)
 
 (defface ediff-fine-diff-C
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((type pc))
 	 (:foreground "white" :background "Turquoise"))
 	(((class color) (min-colors 16))
@@ -1091,7 +1086,7 @@ this variable represents.")
 (ediff-hide-face ediff-fine-diff-face-C)
 
 (defface ediff-fine-diff-Ancestor
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "Black" :background "Green"))
 	(((class color))
@@ -1123,7 +1118,7 @@ this variable represents.")
 	(t "Stipple")))
 
 (defface ediff-even-diff-A
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       `((((type pc))
 	 (:foreground "green3" :background "light grey"))
 	(((class color) (min-colors 16))
@@ -1149,7 +1144,7 @@ this variable represents.")
 (ediff-hide-face ediff-even-diff-face-A)
 
 (defface ediff-even-diff-B
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       `((((class color) (min-colors 16))
 	 (:foreground "White" :background "Grey"))
 	(((class color))
@@ -1170,7 +1165,7 @@ this variable represents.")
 (ediff-hide-face ediff-even-diff-face-B)
 
 (defface ediff-even-diff-C
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       `((((type pc))
 	 (:foreground "yellow3" :background "light grey"))
 	(((class color) (min-colors 16))
@@ -1196,7 +1191,7 @@ this variable represents.")
 (ediff-hide-face ediff-even-diff-face-C)
 
 (defface ediff-even-diff-Ancestor
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       `((((type pc))
 	 (:foreground "cyan3" :background "light grey"))
 	(((class color) (min-colors 16))
@@ -1229,7 +1224,7 @@ this variable represents.")
     (Ancestor . ediff-even-diff-Ancestor)))
 
 (defface ediff-odd-diff-A
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((type pc))
 	 (:foreground "green3" :background "gray40"))
 	(((class color) (min-colors 16))
@@ -1254,7 +1249,7 @@ this variable represents.")
 
 
 (defface ediff-odd-diff-B
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((type pc))
 	 (:foreground "White" :background "gray40"))
 	(((class color) (min-colors 16))
@@ -1278,7 +1273,7 @@ this variable represents.")
 (ediff-hide-face ediff-odd-diff-face-B)
 
 (defface ediff-odd-diff-C
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((type pc))
 	 (:foreground "yellow3" :background "gray40"))
 	(((class color) (min-colors 16))
@@ -1302,7 +1297,7 @@ this variable represents.")
 (ediff-hide-face ediff-odd-diff-face-C)
 
 (defface ediff-odd-diff-Ancestor
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       '((((class color) (min-colors 16))
 	 (:foreground "cyan3" :background "gray40"))
 	(((class color))
@@ -1630,7 +1625,7 @@ This default should work without changes."
   (or frame (setq frame (selected-frame)))
   (if (ediff-window-display-p)
       (let ((frame-or-wind frame))
-	(if ediff-xemacs-p
+	(if (featurep 'xemacs)
 	    (setq frame-or-wind (frame-selected-window frame)))
 	(or do-not-grab-mouse
 	    ;; don't set mouse if the user said to never do this
diff --git a/lisp/ediff-mult.el b/lisp/ediff-mult.el
index 3696d8ae776..51502615cf7 100644
--- a/lisp/ediff-mult.el
+++ b/lisp/ediff-mult.el
@@ -404,7 +404,7 @@ Toggled by ediff-toggle-verbose-help-meta-buffer" )
 	(define-key ediff-meta-buffer-map "=h" 'ediff-meta-mark-equal-files)))
   (if ediff-no-emacs-help-in-control-buffer
       (define-key ediff-meta-buffer-map  "\C-h"  'ediff-previous-meta-item))
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       (define-key ediff-meta-buffer-map [mouse-2] ediff-meta-action-function)
     (define-key ediff-meta-buffer-map [button2] ediff-meta-action-function))
 
@@ -448,7 +448,7 @@ Commands:
 (define-key ediff-dir-diffs-buffer-map "\C-?" 'previous-line)
 (define-key ediff-dir-diffs-buffer-map "p" 'previous-line)
 (define-key ediff-dir-diffs-buffer-map "C" 'ediff-dir-diff-copy-file)
-(if ediff-emacs-p
+(if (featurep 'emacs)
     (define-key ediff-dir-diffs-buffer-map [mouse-2] 'ediff-dir-diff-copy-file)
   (define-key ediff-dir-diffs-buffer-map [button2] 'ediff-dir-diff-copy-file))
 (define-key ediff-dir-diffs-buffer-map [delete] 'previous-line)
@@ -1493,7 +1493,7 @@ Useful commands:
 (defun ediff-set-meta-overlay (b e prop &optional session-number hidden)
   (let (overl)
     (setq overl (ediff-make-overlay b e))
-    (if ediff-emacs-p
+    (if (featurep 'emacs)
 	(ediff-overlay-put overl 'mouse-face 'highlight)
       (ediff-overlay-put overl 'highlight t))
     (ediff-overlay-put overl 'ediff-meta-info prop)
diff --git a/lisp/ediff-util.el b/lisp/ediff-util.el
index f3cffe0847f..2ed8f73a282 100644
--- a/lisp/ediff-util.el
+++ b/lisp/ediff-util.el
@@ -38,7 +38,6 @@
 (defvar bottom-toolbar-visible-p)
 (defvar bottom-toolbar-height)
 (defvar mark-active)
-(defvar ediff-emacs-p)
 
 (defvar ediff-after-quit-hook-internal nil)
 
@@ -64,7 +63,7 @@
     (or (featurep 'ediff)
 	(load "ediff.el" nil nil 'nosuffix))
     (or (featurep 'ediff-tbar)
-	ediff-emacs-p
+	(featurep 'emacs)
 	(load "ediff-tbar.el" 'noerror nil 'nosuffix))
     ))
 ;; end pacifier
@@ -77,7 +76,7 @@
 (require 'ediff-diff)
 (require 'ediff-merg)
 
-(if ediff-xemacs-p
+(if (featurep 'xemacs)
     (require 'ediff-tbar))
 
 
@@ -154,7 +153,7 @@ to invocation.")
   (suppress-keymap ediff-mode-map)
 
   (define-key ediff-mode-map
-    (if ediff-emacs-p [mouse-2] [button2]) 'ediff-help-for-quick-help)
+    (if (featurep 'emacs) [mouse-2] [button2]) 'ediff-help-for-quick-help)
   (define-key ediff-mode-map "\C-m"  'ediff-help-for-quick-help)
 
   (define-key ediff-mode-map "p" 'ediff-previous-difference)
@@ -1275,7 +1274,7 @@ This is especially useful when comparing buffers side-by-side."
   (ediff-barf-if-not-control-buffer)
   (or (ediff-window-display-p)
       (error "%sEmacs is not running as a window application"
-	     (if ediff-emacs-p "" "X")))
+	     (if (featurep 'emacs) "" "X")))
   (ediff-recenter 'no-rehighlight) ; make sure buffs are displayed in windows
   (let ((ctl-buf ediff-control-buffer))
     (setq ediff-wide-display-p (not ediff-wide-display-p))
@@ -1283,7 +1282,7 @@ This is especially useful when comparing buffers side-by-side."
 	(ediff-with-current-buffer ctl-buf
 	  (modify-frame-parameters
 	   ediff-wide-display-frame ediff-wide-display-orig-parameters)
-	  ;;(sit-for (if ediff-xemacs-p 0.4 0))
+	  ;;(sit-for (if (featurep 'xemacs) 0.4 0))
 	  ;; restore control buf, since ctl window may have been deleted
 	  ;; during resizing
 	  (set-buffer ctl-buf)
@@ -1291,7 +1290,7 @@ This is especially useful when comparing buffers side-by-side."
 		ediff-window-B nil) ; force update of window config
 	  (ediff-recenter 'no-rehighlight))
       (funcall ediff-make-wide-display-function)
-      ;;(sit-for (if ediff-xemacs-p 0.4 0))
+      ;;(sit-for (if (featurep 'xemacs) 0.4 0))
       (ediff-with-current-buffer ctl-buf
 	(setq ediff-window-B nil) ; force update of window config
 	(ediff-recenter 'no-rehighlight)))))
@@ -1305,7 +1304,7 @@ which see."
   (let (window-setup-func)
     (or (ediff-window-display-p)
 	(error "%sEmacs is not running as a window application"
-	       (if ediff-emacs-p "" "X")))
+	       (if (featurep 'emacs) "" "X")))
 
   (cond ((eq ediff-window-setup-function 'ediff-setup-windows-multiframe)
 	 (setq window-setup-func 'ediff-setup-windows-plain))
@@ -1335,7 +1334,7 @@ To change the default, set the variable `ediff-use-toolbar-p', which see."
       (progn
 	(or (ediff-window-display-p)
 	    (error "%sEmacs is not running as a window application"
-		   (if ediff-emacs-p "" "X")))
+		   (if (featurep 'emacs) "" "X")))
 	(if (ediff-use-toolbar-p)
 	    (ediff-kill-bottom-toolbar))
 	;; do this only after killing the toolbar
@@ -2529,7 +2528,7 @@ temporarily reverses the meaning of this variable."
 	(cond ((ediff-good-frame-under-mouse))
 	      (t warp-frame)))
   (if (and (ediff-window-display-p) (frame-live-p warp-frame) ediff-grab-mouse)
-      (set-mouse-position (if ediff-emacs-p
+      (set-mouse-position (if (featurep 'emacs)
 			      warp-frame
 			    (frame-selected-window warp-frame))
 			  2 1))
@@ -2544,11 +2543,11 @@ temporarily reverses the meaning of this variable."
 	(buf-name "")
 	frame obj-ok)
     (setq obj-ok
-	  (if ediff-emacs-p
+	  (if (featurep 'emacs)
 	      (frame-live-p frame-or-win)
 	    (window-live-p frame-or-win)))
     (if obj-ok
-	(setq frame (if ediff-emacs-p frame-or-win (window-frame frame-or-win))
+	(setq frame (if (featurep 'emacs) frame-or-win (window-frame frame-or-win))
 	      buf-name
 	      (buffer-name (window-buffer (frame-selected-window frame)))))
     (if (string-match "Minibuf" buf-name)
@@ -3031,7 +3030,7 @@ Hit \\[ediff-recenter] to reset the windows afterward."
 	       (ediff-get-symbol-from-alist
 		buf-type ediff-current-diff-overlay-alist))))
 
-	(if ediff-xemacs-p
+	(if (featurep 'xemacs)
 	    (ediff-move-overlay current-diff-overlay begin end-hilit)
 	  (ediff-move-overlay current-diff-overlay begin end-hilit buff))
 	(ediff-overlay-put current-diff-overlay 'priority
@@ -3611,11 +3610,11 @@ Ediff Control Panel to restore highlighting."
 (defun ediff-remove-flags-from-buffer (buffer overlay)
   (ediff-with-current-buffer buffer
     (let ((inhibit-read-only t))
-      (if ediff-xemacs-p
+      (if (featurep 'xemacs)
 	  (ediff-overlay-put overlay 'begin-glyph nil)
 	(ediff-overlay-put overlay 'before-string nil))
 
-      (if ediff-xemacs-p
+      (if (featurep 'xemacs)
 	  (ediff-overlay-put overlay 'end-glyph nil)
 	(ediff-overlay-put overlay 'after-string nil))
       )))
@@ -3643,7 +3642,7 @@ Ediff Control Panel to restore highlighting."
 			 ediff-before-flag-bol ediff-before-flag-mol))))
 
     ;; insert the flag itself
-    (if ediff-xemacs-p
+    (if (featurep 'xemacs)
 	(ediff-overlay-put curr-overl 'begin-glyph flag)
       (ediff-overlay-put curr-overl 'before-string flag))
 
@@ -3659,7 +3658,7 @@ Ediff Control Panel to restore highlighting."
 			 ediff-after-flag-eol ediff-after-flag-mol))))
 
     ;; insert the flag itself
-    (if ediff-xemacs-p
+    (if (featurep 'xemacs)
 	(ediff-overlay-put curr-overl 'end-glyph flag)
       (ediff-overlay-put curr-overl 'after-string flag))
     ))
@@ -3786,10 +3785,10 @@ Ediff Control Panel to restore highlighting."
 
 	  ;; never detach
 	  (ediff-overlay-put
-	   overl (if ediff-emacs-p 'evaporate 'detachable) nil)
+	   overl (if (featurep 'emacs) 'evaporate 'detachable) nil)
 	  ;; make overlay open-ended
 	  ;; In emacs, it is made open ended at creation time
-	  (if ediff-xemacs-p
+	  (if (featurep 'xemacs)
 	      (progn
 		(ediff-overlay-put overl 'start-open nil)
 		(ediff-overlay-put overl 'end-open nil)))
diff --git a/lisp/ediff-wind.el b/lisp/ediff-wind.el
index c2c130ac6bb..8b72a673d17 100644
--- a/lisp/ediff-wind.el
+++ b/lisp/ediff-wind.el
@@ -39,7 +39,6 @@
 (defvar top-gutter)
 (defvar frame-icon-title-format)
 (defvar ediff-diff-status)
-(defvar ediff-emacs-p)
 
 (eval-when-compile
   (let ((load-path (cons (expand-file-name ".") load-path)))
@@ -50,7 +49,7 @@
     (or (featurep 'ediff-help)
 	(load "ediff-help.el" nil nil 'nosuffix))
     (or (featurep 'ediff-tbar)
-	ediff-emacs-p
+	(featurep 'emacs)
 	(load "ediff-tbar.el" 'noerror nil 'nosuffix))
     ))
 ;; end pacifier
@@ -58,7 +57,7 @@
 (require 'ediff-init)
 
 ;; be careful with ediff-tbar
-(if ediff-xemacs-p
+(if (featurep 'xemacs)
     (condition-case nil
 	(require 'ediff-tbar)
       (error
@@ -213,7 +212,7 @@ customization of the default control frame positioning."
   :type 'integer
   :group 'ediff-window)
 
-(defcustom ediff-narrow-control-frame-leftward-shift (if ediff-xemacs-p 7 3)
+(defcustom ediff-narrow-control-frame-leftward-shift (if (featurep 'xemacs) 7 3)
   "*The leftward shift of control frame from the right edge of buf A's frame.
 Measured in characters.
 This is used by the default control frame positioning function,
@@ -380,7 +379,7 @@ into icons, regardless of the window manager."
     ;; XEmacs used to have a lot of trouble with display
     ;; It did't set things right unless we tell it to sit still
     ;; 19.12 seems ok.
-    ;;(if ediff-xemacs-p (sit-for 0))
+    ;;(if (featurep 'xemacs) (sit-for 0))
 
     (split-window-vertically (max 2 (- (window-height) merge-window-lines)))
     (if (eq (selected-window) wind-A)
@@ -443,7 +442,7 @@ into icons, regardless of the window manager."
     ;; XEmacs used to have a lot of trouble with display
     ;; It did't set things right unless we told it to sit still
     ;; 19.12 seems ok.
-    ;;(if ediff-xemacs-p (sit-for 0))
+    ;;(if (featurep 'xemacs) (sit-for 0))
 
     (funcall split-window-function wind-width-or-height)
 
@@ -1043,7 +1042,7 @@ into icons, regardless of the window manager."
 			   (or (eq this-command 'ediff-quit)
 			       (not (eq ediff-grab-mouse t)))))
 
-    (if ediff-xemacs-p
+    (if (featurep 'xemacs)
 	(ediff-with-current-buffer ctl-buffer
 	  (ediff-cond-compile-for-xemacs-or-emacs
 	   (make-local-hook 'select-frame-hook) ; xemacs
@@ -1238,7 +1237,7 @@ It assumes that it is called from within the control buffer."
 
 
 (defun ediff-refresh-control-frame ()
-  (if ediff-emacs-p
+  (if (featurep 'emacs)
       ;; set frame/icon titles for Emacs
       (modify-frame-parameters
        ediff-control-frame
@@ -1288,7 +1287,7 @@ It assumes that it is called from within the control buffer."
 ;; If buff is not live, return nil
 (defun ediff-get-visible-buffer-window (buff)
   (if (ediff-buffer-live-p buff)
-      (if ediff-xemacs-p
+      (if (featurep 'xemacs)
 	  (get-buffer-window buff t)
 	(get-buffer-window buff 'visible))))
 
diff --git a/lisp/ediff.el b/lisp/ediff.el
index 8911dc599f1..a2aafc90292 100644
--- a/lisp/ediff.el
+++ b/lisp/ediff.el
@@ -1440,7 +1440,7 @@ With optional NODE, goes to that node."
     (condition-case nil
 	(progn
 	  (pop-to-buffer (get-buffer-create "*info*"))
-	  (info (if ediff-xemacs-p "ediff.info" "ediff"))
+	  (info (if (featurep 'xemacs) "ediff.info" "ediff"))
 	  (if node
 	      (Info-goto-node node)
 	    (message "Type `i' to search for a specific topic"))
diff --git a/lisp/emulation/viper-cmd.el b/lisp/emulation/viper-cmd.el
index 88af961e488..5e13edb9495 100644
--- a/lisp/emulation/viper-cmd.el
+++ b/lisp/emulation/viper-cmd.el
@@ -834,7 +834,7 @@ Vi's prefix argument will be used.  Otherwise, the prefix argument passed to
 	    viper-emacs-kbd-minor-mode
 	    ch)
 	(cond ((and viper-special-input-method
-		    viper-emacs-p
+		    (featurep 'emacs)
 		    (fboundp 'quail-input-method))
 	       ;; (let ...) is used to restore unread-command-events to the
 	       ;; original state. We don't want anything left in there after
@@ -861,7 +861,7 @@ Vi's prefix argument will be used.  Otherwise, the prefix argument passed to
 				    (1- (length quail-current-str)))))
 		 ))
 	      ((and viper-special-input-method
-		    viper-xemacs-p
+		    (featurep 'xemacs)
 		    (fboundp 'quail-start-translation))
 	       ;; same as above but for XEmacs, which doesn't have
 	       ;; quail-input-method
@@ -893,7 +893,7 @@ Vi's prefix argument will be used.  Otherwise, the prefix argument passed to
 	      (t
 	       ;;(setq ch (read-char-exclusive))
 	       (setq ch (aref (read-key-sequence nil) 0))
-	       (if viper-xemacs-p
+	       (if (featurep 'xemacs)
 		   (setq ch (event-to-character ch)))
 	       ;; replace ^M with the newline
 	       (if (eq ch ?\C-m) (setq ch ?\n))
@@ -902,13 +902,13 @@ Vi's prefix argument will be used.  Otherwise, the prefix argument passed to
 		   (progn
 		     ;;(setq ch (read-char-exclusive))
 		     (setq ch (aref (read-key-sequence nil) 0))
-		     (if viper-xemacs-p
+		     (if (featurep 'xemacs)
 			 (setq ch (event-to-character ch))))
 		 )
 	       (insert ch))
 	      )
 	(setq last-command-event
-	      (viper-copy-event (if viper-xemacs-p
+	      (viper-copy-event (if (featurep 'xemacs)
 				    (character-to-event ch) ch)))
 	) ; let
     (error nil)
@@ -1080,10 +1080,10 @@ as a Meta key and any number of multiple escapes is allowed."
 			 ;; and return ESC as the key-sequence
 			 (viper-set-unread-command-events (viper-subseq keyseq 1))
 			 (setq last-input-event event
-			       keyseq (if viper-emacs-p
+			       keyseq (if (featurep 'emacs)
 					  "\e"
 					(vector (character-to-event ?\e)))))
-			((and viper-xemacs-p
+			((and (featurep 'xemacs)
 			      (key-press-event-p first-key)
 			      (equal '(meta) key-mod))
 			 (viper-set-unread-command-events
@@ -1320,7 +1320,7 @@ as a Meta key and any number of multiple escapes is allowed."
 	  (setq last-command-char char)
 	  (setq last-command-event
 		(viper-copy-event
-		 (if viper-xemacs-p (character-to-event char) char)))
+		 (if (featurep 'xemacs) (character-to-event char) char)))
 	  (condition-case err
 	      (funcall cmd-to-exec-at-end cmd-info)
 	    (error
@@ -2791,7 +2791,7 @@ On reaching beginning of line, stop and signal error."
 (defun viper-next-line-carefully (arg)
   (condition-case nil
       ;; do not use forward-line! need to keep column
-      (next-line arg)
+      (with-no-warnings (next-line arg))
     (error nil)))
 
 
@@ -3091,7 +3091,7 @@ On reaching beginning of line, stop and signal error."
 	(com (viper-getCom arg)))
     (if com (viper-move-marker-locally 'viper-com-point (point)))
     ;; do not use forward-line! need to keep column
-    (next-line val)
+    (with-no-warnings (next-line val))
     (if viper-ex-style-motion
 	(if (and (eolp) (not (bolp))) (backward-char 1)))
     (setq this-command 'next-line)
@@ -3135,7 +3135,7 @@ If point is on a widget or a button, simulate clicking on that widget/button."
 	(com (viper-getCom arg)))
     (if com (viper-move-marker-locally 'viper-com-point (point)))
     ;; do not use forward-line! need to keep column
-    (previous-line val)
+    (with-no-warnings (previous-line val))
     (if viper-ex-style-motion
 	(if (and (eolp) (not (bolp))) (backward-char 1)))
     (setq this-command 'previous-line)
diff --git a/lisp/emulation/viper-ex.el b/lisp/emulation/viper-ex.el
index d9cc97719ca..caeecd12c8a 100644
--- a/lisp/emulation/viper-ex.el
+++ b/lisp/emulation/viper-ex.el
@@ -1103,7 +1103,7 @@ reversed."
 	 beg end cont val)
 
     (viper-add-keymap ex-read-filename-map
-		    (if viper-emacs-p
+		    (if (featurep 'emacs)
 			minibuffer-local-completion-map
 		      read-file-name-map))
 
@@ -1558,7 +1558,7 @@ reversed."
       ;; setup buffer
       (if (setq wind (viper-get-visible-buffer-window buf))
 	  ()
-	(setq wind (get-lru-window (if viper-xemacs-p nil 'visible)))
+	(setq wind (get-lru-window (if (featurep 'xemacs) nil 'visible)))
 	(set-window-buffer wind buf))
 
       (if (viper-window-display-p)
@@ -1878,7 +1878,7 @@ reversed."
   (condition-case nil
       (progn
 	(pop-to-buffer (get-buffer-create "*info*"))
-	(info (if viper-xemacs-p "viper.info" "viper"))
+	(info (if (featurep 'xemacs) "viper.info" "viper"))
 	(message "Type `i' to search for a specific topic"))
     (error (beep 1)
 	   (with-output-to-temp-buffer " *viper-info*"
@@ -1887,7 +1887,7 @@ The Info file for Viper does not seem to be installed.
 
 This file is part of the standard distribution of %sEmacs.
 Please contact your system administrator. "
-			    (if viper-xemacs-p "X" "")
+			    (if (featurep 'xemacs) "X" "")
 			    ))))))
 
 ;; Ex source command.  Loads the file specified as argument or `~/.viper'
diff --git a/lisp/emulation/viper-init.el b/lisp/emulation/viper-init.el
index 1b05ef7189d..1b1e07a0a0c 100644
--- a/lisp/emulation/viper-init.el
+++ b/lisp/emulation/viper-init.el
@@ -49,10 +49,6 @@
   (interactive)
   (message "Viper version is %s" viper-version))
 
-;; Is it XEmacs?
-(defconst viper-xemacs-p (featurep 'xemacs))
-;; Is it Emacs?
-(defconst viper-emacs-p (not viper-xemacs-p))
 ;; Tell whether we are running as a window application or on a TTY
 
 ;; This is used to avoid compilation warnings. When emacs/xemacs forms can
@@ -116,8 +112,8 @@ In all likelihood, you don't need to bother with this setting."
   (cond ((viper-window-display-p))
 	(viper-force-faces)
 	((viper-color-display-p))
-	(viper-emacs-p (memq (viper-device-type) '(pc)))
-	(viper-xemacs-p (memq (viper-device-type) '(tty pc)))))
+	((featurep 'emacs) (memq (viper-device-type) '(pc)))
+	((featurep 'xemacs) (memq (viper-device-type) '(tty pc)))))
 
 
 ;;; Macros
@@ -356,9 +352,9 @@ Use `M-x viper-set-expert-level' to change this.")
 		   "")))))
 
 (defun viper-inactivate-input-method ()
-  (cond ((and viper-emacs-p (fboundp 'inactivate-input-method))
+  (cond ((and (featurep 'emacs) (fboundp 'inactivate-input-method))
 	 (inactivate-input-method))
-	((and viper-xemacs-p (boundp 'current-input-method))
+	((and (featurep 'xemacs) (boundp 'current-input-method))
 	 ;; XEmacs had broken quil-mode for some time, so we are working around
 	 ;; it here
 	 (setq quail-mode nil)
@@ -370,7 +366,7 @@ Use `M-x viper-set-expert-level' to change this.")
 	 (force-mode-line-update))
 	))
 (defun viper-activate-input-method ()
-  (cond ((and viper-emacs-p (fboundp 'activate-input-method))
+  (cond ((and (featurep 'emacs) (fboundp 'activate-input-method))
 	 (activate-input-method default-input-method))
 	((featurep 'xemacs)
 	 (if (fboundp 'quail-mode) (quail-mode 1)))))
@@ -475,7 +471,7 @@ is non-nil."
   :group 'viper)
 (defcustom viper-use-replace-region-delimiters
   (or (not (viper-has-face-support-p))
-      (and viper-xemacs-p (eq (viper-device-type) 'tty)))
+      (and (featurep 'xemacs) (eq (viper-device-type) 'tty)))
   "*If non-nil, Viper will always use `viper-replace-region-end-delimiter' and
 `viper-replace-region-start-delimiter' to delimit replacement regions, even on
 color displays.  By default, the delimiters are used only on TTYs."
@@ -1018,13 +1014,13 @@ Should be set in `~/.viper' file."
 
 (defun viper-restore-cursor-type ()
   (condition-case nil
-      (if viper-xemacs-p
+      (if (featurep 'xemacs)
 	  (set (make-local-variable 'bar-cursor) nil)
 	(setq cursor-type default-cursor-type))
     (error nil)))
 
 (defun viper-set-insert-cursor-type ()
-  (if viper-xemacs-p
+  (if (featurep 'xemacs)
       (set (make-local-variable 'bar-cursor) 2)
     (setq cursor-type '(bar . 2))))
 
diff --git a/lisp/emulation/viper-macs.el b/lisp/emulation/viper-macs.el
index bf3f0eefb39..788feaf86e6 100644
--- a/lisp/emulation/viper-macs.el
+++ b/lisp/emulation/viper-macs.el
@@ -826,7 +826,7 @@ name from there."
 (defun viper-char-array-to-macro (array)
   (let ((vec (vconcat array))
 	macro)
-    (if viper-xemacs-p
+    (if (featurep 'xemacs)
 	(setq macro (mapcar 'character-to-event vec))
       (setq macro vec))
     (vconcat (mapcar 'viper-event-key macro))))
diff --git a/lisp/emulation/viper-mous.el b/lisp/emulation/viper-mous.el
index e95e80aa4e0..7a47d321890 100644
--- a/lisp/emulation/viper-mous.el
+++ b/lisp/emulation/viper-mous.el
@@ -79,7 +79,7 @@ or a tripple-click."
 ;; time interval in millisecond within which successive clicks are
 ;; considered related
 (defcustom viper-multiclick-timeout (if (viper-window-display-p)
-				      (if viper-xemacs-p
+				      (if (featurep 'xemacs)
 					  mouse-track-multi-click-time
 					double-click-time)
 				    500)
@@ -227,7 +227,7 @@ is ignored."
        ) ; if
      ;; XEmacs doesn't have set-text-properties, but there buffer-substring
      ;; doesn't return properties together with the string, so it's not needed.
-     (if viper-emacs-p
+     (if (featurep 'emacs)
 	 (set-text-properties 0 (length result) nil result))
      result
      ))
@@ -273,7 +273,7 @@ See `viper-surrounding-word' for the definition of a word in this case."
 		     'viper-mouse-catch-frame-switch))
 	    (not (eq (key-binding viper-mouse-up-insert-key-parsed)
 		     'viper-mouse-click-insert-word))
-	    (and viper-xemacs-p (not (event-over-text-area-p click)))))
+	    (and (featurep 'xemacs) (not (event-over-text-area-p click)))))
       () ; do nothing, if binding isn't right or not over text
     ;; turn arg into a number
     (cond ((integerp arg) nil)
@@ -364,7 +364,7 @@ this command."
 		     'viper-mouse-catch-frame-switch))
 	    (not (eq (key-binding viper-mouse-up-search-key-parsed)
 		     'viper-mouse-click-search-word))
-	    (and viper-xemacs-p (not (event-over-text-area-p click)))))
+	    (and (featurep 'xemacs) (not (event-over-text-area-p click)))))
       () ; do nothing, if binding isn't right or not over text
     (let ((previous-search-string viper-s-string)
 	  click-word click-count)
@@ -507,19 +507,19 @@ bindings in the Viper manual."
 	()
       (setq button-spec
 	    (cond ((memq 1 key)
-		   (if viper-emacs-p
+		   (if (featurep 'emacs)
 		       (if (eq 'up event-type)
 			   "mouse-1" "down-mouse-1")
 		     (if (eq 'up event-type)
 			 'button1up 'button1)))
 		  ((memq 2 key)
-		   (if viper-emacs-p
+		   (if (featurep 'emacs)
 		       (if (eq 'up event-type)
 			   "mouse-2" "down-mouse-2")
 		     (if (eq 'up event-type)
 			 'button2up 'button2)))
 		  ((memq 3 key)
-		   (if viper-emacs-p
+		   (if (featurep 'emacs)
 		       (if (eq 'up event-type)
 			   "mouse-3" "down-mouse-3")
 		     (if (eq 'up event-type)
@@ -528,18 +528,18 @@ bindings in the Viper manual."
 		      "%S: invalid button number, %S" key-var key)))
 	    meta-spec
 	    (if (memq 'meta key)
-		(if viper-emacs-p "M-" 'meta)
-	      (if viper-emacs-p "" nil))
+		(if (featurep 'emacs) "M-" 'meta)
+	      (if (featurep 'emacs) "" nil))
 	    shift-spec
 	    (if (memq 'shift key)
-		(if viper-emacs-p "S-" 'shift)
-	      (if viper-emacs-p "" nil))
+		(if (featurep 'emacs) "S-" 'shift)
+	      (if (featurep 'emacs) "" nil))
 	    control-spec
 	    (if (memq 'control key)
-		(if viper-emacs-p "C-" 'control)
-	      (if viper-emacs-p "" nil)))
+		(if (featurep 'emacs) "C-" 'control)
+	      (if (featurep 'emacs) "" nil)))
 
-      (setq key-spec (if viper-emacs-p
+      (setq key-spec (if (featurep 'emacs)
 			 (vector
 			  (intern
 			   (concat
diff --git a/lisp/emulation/viper-util.el b/lisp/emulation/viper-util.el
index 7073cd019dd..c757eb63aef 100644
--- a/lisp/emulation/viper-util.el
+++ b/lisp/emulation/viper-util.el
@@ -64,48 +64,34 @@
       (fset 'x-color-defined-p (symbol-function 'ns-color-defined-p)))
 
 
-;;; XEmacs support
-
-
-(viper-cond-compile-for-xemacs-or-emacs
- (progn ; xemacs
-   (fset 'viper-overlay-p (symbol-function 'extentp))
-   (fset 'viper-make-overlay (symbol-function 'make-extent))
-   (fset 'viper-overlay-live-p (symbol-function 'extent-live-p))
-   (fset 'viper-move-overlay (symbol-function 'set-extent-endpoints))
-   (fset 'viper-overlay-start (symbol-function 'extent-start-position))
-   (fset 'viper-overlay-end (symbol-function 'extent-end-position))
-   (fset 'viper-overlay-get (symbol-function 'extent-property))
-   (fset 'viper-overlay-put (symbol-function 'set-extent-property))
-   (fset 'viper-read-event (symbol-function 'next-command-event))
-   (fset 'viper-characterp (symbol-function 'characterp))
-   (fset 'viper-int-to-char (symbol-function 'int-to-char))
-   (if (viper-window-display-p)
-       (fset 'viper-iconify (symbol-function 'iconify-frame)))
-   (cond ((viper-has-face-support-p)
-	  (fset 'viper-get-face (symbol-function 'get-face))
-	  (fset 'viper-color-defined-p (symbol-function 'valid-color-name-p))
-	  )))
- (progn ; emacs
-   (fset 'viper-overlay-p (symbol-function 'overlayp))
-   (fset 'viper-make-overlay (symbol-function 'make-overlay))
-   (fset 'viper-overlay-live-p (symbol-function 'overlayp))
-   (fset 'viper-move-overlay (symbol-function 'move-overlay))
-   (fset 'viper-overlay-start (symbol-function 'overlay-start))
-   (fset 'viper-overlay-end (symbol-function 'overlay-end))
-   (fset 'viper-overlay-get (symbol-function 'overlay-get))
-   (fset 'viper-overlay-put (symbol-function 'overlay-put))
-   (fset 'viper-read-event (symbol-function 'read-event))
-   (fset 'viper-characterp (symbol-function 'integerp))
-   (fset 'viper-int-to-char (symbol-function 'identity))
-   (if (viper-window-display-p)
-       (fset 'viper-iconify (symbol-function 'iconify-or-deiconify-frame)))
-   (cond ((viper-has-face-support-p)
-	  (fset 'viper-get-face (symbol-function 'internal-get-face))
-	  (fset 'viper-color-defined-p (symbol-function 'x-color-defined-p))
-	  )))
- )
-
+(defalias 'viper-overlay-p 
+  (if (featurep 'xemacs) 'extentp 'overlayp))
+(defalias 'viper-make-overlay 
+  (if (featurep 'xemacs) 'make-extent 'make-overlay))
+(defalias 'viper-overlay-live-p 
+  (if (featurep 'xemacs) 'extent-live-p 'overlayp))
+(defalias 'viper-move-overlay 
+  (if (featurep 'xemacs) 'set-extent-endpoints 'move-overlay))
+(defalias 'viper-overlay-start 
+  (if (featurep 'xemacs) 'extent-start-position 'overlay-start))
+(defalias 'viper-overlay-end 
+  (if (featurep 'xemacs) 'extent-end-position 'overlay-end))
+(defalias 'viper-overlay-get 
+  (if (featurep 'xemacs) 'extent-property 'overlay-get))
+(defalias 'viper-overlay-put 
+  (if (featurep 'xemacs) 'set-extent-property 'overlay-put))
+(defalias 'viper-read-event 
+  (if (featurep 'xemacs) 'next-command-event 'read-event))
+(defalias 'viper-characterp 
+  (if (featurep 'xemacs) 'characterp 'integerp))
+(defalias 'viper-int-to-char 
+  (if (featurep 'xemacs) 'int-to-char 'identity))
+(defalias 'viper-get-face 
+  (if (featurep 'xemacs) 'get-face 'internal-get-face))
+(defalias 'viper-color-defined-p 
+  (if (featurep 'xemacs) 'valid-color-name-p 'x-color-defined-p))
+(defalias 'viper-iconify
+  (if (featurep 'xemacs) 'iconify-frame 'iconify-or-deiconify-frame))
 
 
 ;; CHAR is supposed to be a char or an integer (positive or negative)
@@ -201,7 +187,7 @@
 (defsubst viper-get-saved-cursor-color-in-replace-mode ()
   (or
    (funcall
-    (if viper-emacs-p 'frame-parameter 'frame-property)
+    (if (featurep 'emacs) 'frame-parameter 'frame-property)
     (selected-frame)
     'viper-saved-cursor-color-in-replace-mode)
    (if (and (eq viper-current-state 'emacs-mode) viper-emacs-state-cursor-color)
@@ -211,7 +197,7 @@
 (defsubst viper-get-saved-cursor-color-in-insert-mode ()
   (or
    (funcall
-    (if viper-emacs-p 'frame-parameter 'frame-property)
+    (if (featurep 'emacs) 'frame-parameter 'frame-property)
     (selected-frame)
     'viper-saved-cursor-color-in-insert-mode)
    (if (and (eq viper-current-state 'emacs-mode) viper-emacs-state-cursor-color)
@@ -221,7 +207,7 @@
 (defsubst viper-get-saved-cursor-color-in-emacs-mode ()
   (or
    (funcall
-    (if viper-emacs-p 'frame-parameter 'frame-property)
+    (if (featurep 'emacs) 'frame-parameter 'frame-property)
     (selected-frame)
     'viper-saved-cursor-color-in-emacs-mode)
    viper-vi-state-cursor-color))
@@ -249,8 +235,8 @@
 ;; testing for sufficiently high Emacs versions.
 (defun viper-check-version (op major minor &optional type-of-emacs)
   (if (and (boundp 'emacs-major-version) (boundp 'emacs-minor-version))
-      (and (cond ((eq type-of-emacs 'xemacs) viper-xemacs-p)
-		 ((eq type-of-emacs 'emacs) viper-emacs-p)
+      (and (cond ((eq type-of-emacs 'xemacs) (featurep 'xemacs))
+		 ((eq type-of-emacs 'emacs) (featurep 'emacs))
 		 (t t))
 	   (cond ((eq op '=) (and (= emacs-minor-version minor)
 				  (= emacs-major-version major)))
@@ -267,7 +253,7 @@
 
 
 (defun viper-get-visible-buffer-window (wind)
-  (if viper-xemacs-p
+  (if (featurep 'xemacs)
       (get-buffer-window wind t)
     (get-buffer-window wind 'visible)))
 
@@ -724,13 +710,14 @@
 (defsubst viper-file-checked-in-p (file)
   (and (featurep 'vc-hooks)
        ;; CVS files are considered not checked in
+       ;; FIXME: Should this deal with more than CVS?
        (not (memq (vc-backend file) '(nil CVS)))
        (if (fboundp 'vc-state)
 	   (and
 	     (not (memq (vc-state file) '(edited needs-merge)))
 	     (not (stringp (vc-state file))))
 	 ;; XEmacs has no vc-state
-	 (not (vc-locking-user file)))
+	 (if (featurep 'xemacs)(not (vc-locking-user file))))
        ))
 
 ;; checkout if visited file is checked in
@@ -787,7 +774,7 @@
     (setq viper-replace-overlay (viper-make-overlay beg end (current-buffer)))
     ;; never detach
     (viper-overlay-put
-     viper-replace-overlay (if viper-emacs-p 'evaporate 'detachable) nil)
+     viper-replace-overlay (if (featurep 'emacs) 'evaporate 'detachable) nil)
     (viper-overlay-put
      viper-replace-overlay 'priority viper-replace-overlay-priority)
     ;; If Emacs will start supporting overlay maps, as it currently supports
@@ -795,7 +782,7 @@
     ;; just have keymap attached to replace overlay.
     ;;(viper-overlay-put
     ;; viper-replace-overlay
-    ;; (if viper-xemacs-p 'keymap 'local-map)
+    ;; (if (featurep 'xemacs) 'keymap 'local-map)
     ;; viper-replace-map)
     )
   (if (viper-has-face-support-p)
@@ -811,8 +798,8 @@
       (viper-set-replace-overlay (point-min) (point-min)))
   (if (or (not (viper-has-face-support-p))
 	  viper-use-replace-region-delimiters)
-      (let ((before-name (if viper-xemacs-p 'begin-glyph 'before-string))
-	    (after-name (if viper-xemacs-p 'end-glyph 'after-string)))
+      (let ((before-name (if (featurep 'xemacs) 'begin-glyph 'before-string))
+	    (after-name (if (featurep 'xemacs) 'end-glyph 'after-string)))
 	(viper-overlay-put viper-replace-overlay before-name before-glyph)
 	(viper-overlay-put viper-replace-overlay after-name after-glyph))))
 
@@ -843,11 +830,11 @@
 	;; never detach
 	(viper-overlay-put
 	 viper-minibuffer-overlay
-	 (if viper-emacs-p 'evaporate 'detachable)
+	 (if (featurep 'emacs) 'evaporate 'detachable)
 	 nil)
 	;; make viper-minibuffer-overlay open-ended
 	;; In emacs, it is made open ended at creation time
-	(if viper-xemacs-p
+	(if (featurep 'xemacs)
 	    (progn
 	      (viper-overlay-put viper-minibuffer-overlay 'start-open nil)
 	      (viper-overlay-put viper-minibuffer-overlay 'end-open nil)))
@@ -860,7 +847,7 @@
        (if (fboundp 'minibuffer-prompt-end) (minibuffer-prompt-end) 1)
        (1+ (buffer-size)))
     (setq viper-minibuffer-overlay
-	  (if viper-xemacs-p
+	  (if (featurep 'xemacs)
 	      (viper-make-overlay 1 (1+ (buffer-size)) (current-buffer))
 	    ;; make overlay open-ended
 	    (viper-make-overlay
@@ -983,7 +970,7 @@
 (defun viper-read-key-sequence (prompt &optional continue-echo)
   (let (inhibit-quit event keyseq)
     (setq keyseq (read-key-sequence prompt continue-echo))
-    (setq event (if viper-xemacs-p
+    (setq event (if (featurep 'xemacs)
 		    (elt keyseq 0) ; XEmacs returns vector of events
 		  (elt (listify-key-sequence keyseq) 0)))
     (if (viper-ESC-event-p event)
@@ -1078,7 +1065,7 @@
 
 (defun viper-key-to-emacs-key (key)
   (let (key-name char-p modifiers mod-char-list base-key base-key-name)
-    (cond (viper-xemacs-p key)
+    (cond ((featurep 'xemacs) key)
 
 	  ((symbolp key)
 	   (setq key-name (symbol-name key))
@@ -1086,10 +1073,10 @@
 		  (string-to-char key-name))
 		 ;; Emacs doesn't recognize `return' and `escape' as events on
 		 ;; dumb terminals, so we translate them into characters
-		 ((and viper-emacs-p (not (viper-window-display-p))
+		 ((and (featurep 'emacs) (not (viper-window-display-p))
 		       (string= key-name "return"))
 		  ?\C-m)
-		 ((and viper-emacs-p (not (viper-window-display-p))
+		 ((and (featurep 'emacs) (not (viper-window-display-p))
 		       (string= key-name "escape"))
 		  ?\e)
 		 ;; pass symbol-event as is
@@ -1123,14 +1110,15 @@
 
 ;; LIS is assumed to be a list of events of characters
 (defun viper-eventify-list-xemacs (lis)
-  (mapcar
-   (lambda (elt)
-     (cond ((viper-characterp elt) (character-to-event elt))
-	   ((eventp elt)  elt)
-	   (t (error
-	       "viper-eventify-list-xemacs: can't convert to event, %S"
-	       elt))))
-   lis))
+  (if (featurep 'xemacs)
+      (mapcar
+       (lambda (elt)
+	 (cond ((viper-characterp elt) (character-to-event elt))
+	       ((eventp elt)  elt)
+	       (t (error
+		   "viper-eventify-list-xemacs: can't convert to event, %S"
+		   elt))))
+       lis)))
 
 
 ;; Smoothes out the difference between Emacs' unread-command-events
@@ -1142,7 +1130,7 @@
 ;; into an event.  Below, we delete nil from event lists, since nil is the most
 ;; common symbol that might appear in this wrong context.
 (defun viper-set-unread-command-events (arg)
-  (if viper-emacs-p
+  (if (featurep 'emacs)
       (setq
        unread-command-events
        (let ((new-events
diff --git a/lisp/emulation/viper.el b/lisp/emulation/viper.el
index c0118250167..65d40e8bad7 100644
--- a/lisp/emulation/viper.el
+++ b/lisp/emulation/viper.el
@@ -690,7 +690,7 @@ It also can't undo some Viper settings."
   (setq default-major-mode
 	(viper-standard-value 'default-major-mode viper-saved-non-viper-variables))
 
-  (if viper-emacs-p
+  (if (featurep 'emacs)
       (setq-default
        mark-even-if-inactive
        (viper-standard-value
@@ -701,7 +701,7 @@ It also can't undo some Viper settings."
       (and (fboundp 'add-to-ordered-list) (boundp 'emulation-mode-map-alists))
     (viper-delocalize-var 'minor-mode-map-alist))
   (viper-delocalize-var 'require-final-newline)
-  (if viper-xemacs-p (viper-delocalize-var 'bar-cursor))
+  (if (featurep 'xemacs) (viper-delocalize-var 'bar-cursor))
 
 
   ;; deactivate all advices done by Viper.
@@ -788,7 +788,7 @@ It also can't undo some Viper settings."
   ;; In emacs, we have to advice handle-switch-frame
   ;; This advice is undone earlier, when all advices matchine "viper-" are
   ;; deactivated.
-  (if viper-xemacs-p
+  (if (featurep 'xemacs)
       (remove-hook 'mouse-leave-frame-hook 'viper-remember-current-frame))
   ) ; end viper-go-away
 
@@ -981,7 +981,7 @@ It also can't undo some Viper settings."
 	)))
 
   ;; International input methods
-  (if viper-emacs-p
+  (if (featurep 'emacs)
       (eval-after-load "mule-cmds"
 	'(progn
 	   (defadvice inactivate-input-method (after viper-mule-advice activate)
@@ -1022,7 +1022,7 @@ It also can't undo some Viper settings."
 	require-final-newline t)
 
   ;; don't bark when mark is inactive
-  (if viper-emacs-p
+  (if (featurep 'emacs)
       (setq mark-even-if-inactive t))
 
   (setq scroll-step 1)
@@ -1094,12 +1094,12 @@ It also can't undo some Viper settings."
     "Use `read-file-name' for reading arguments."
     (interactive (cons (read-file-name "Find file: " nil default-directory)
 		       ;; XEmacs: if Mule & prefix arg, ask for coding system
-		       (cond ((and viper-xemacs-p (featurep 'mule))
+		       (cond ((and (featurep 'xemacs) (featurep 'mule))
 			      (list
 			       (and current-prefix-arg
 				    (read-coding-system "Coding-system: "))))
 			     ;; Emacs: do wildcards
-			     ((and viper-emacs-p (boundp 'find-file-wildcards))
+			     ((and (featurep 'emacs) (boundp 'find-file-wildcards))
 				   (list find-file-wildcards))))
 		 ))
 
@@ -1108,12 +1108,12 @@ It also can't undo some Viper settings."
     (interactive (cons (read-file-name "Find file in other window: "
 				       nil default-directory)
 		       ;; XEmacs: if Mule & prefix arg, ask for coding system
-		       (cond ((and viper-xemacs-p (featurep 'mule))
+		       (cond ((and (featurep 'xemacs) (featurep 'mule))
 			      (list
 			       (and current-prefix-arg
 				    (read-coding-system "Coding-system: "))))
 			     ;; Emacs: do wildcards
-			     ((and viper-emacs-p (boundp 'find-file-wildcards))
+			     ((and (featurep 'emacs) (boundp 'find-file-wildcards))
 			      (list find-file-wildcards))))
 		 ))
 
@@ -1123,12 +1123,12 @@ It also can't undo some Viper settings."
     (interactive (cons (read-file-name "Find file in other frame: "
 				       nil default-directory)
 		       ;; XEmacs: if Mule & prefix arg, ask for coding system
-		       (cond ((and viper-xemacs-p (featurep 'mule))
+		       (cond ((and (featurep 'xemacs) (featurep 'mule))
 			      (list
 			       (and current-prefix-arg
 				    (read-coding-system "Coding-system: "))))
 			     ;; Emacs: do wildcards
-			     ((and viper-emacs-p (boundp 'find-file-wildcards))
+			     ((and (featurep 'emacs) (boundp 'find-file-wildcards))
 			      (list find-file-wildcards))))
 		 ))
 
@@ -1159,7 +1159,7 @@ It also can't undo some Viper settings."
 
   ;; catch frame switching event
   (if (viper-window-display-p)
-      (if viper-xemacs-p
+      (if (featurep 'xemacs)
 	     (add-hook 'mouse-leave-frame-hook
 		       'viper-remember-current-frame)
 	   (defadvice handle-switch-frame (before viper-frame-advice activate)
@@ -1227,7 +1227,7 @@ These two lines must come in the order given.
 	   (cons 'mode-line-buffer-identification
 		 (list (default-value 'mode-line-buffer-identification)))
 	   (cons 'global-mode-string (list global-mode-string))
-	   (if viper-emacs-p
+	   (if (featurep 'emacs)
 	       (cons 'mark-even-if-inactive (list mark-even-if-inactive)))
 	   )))
 
diff --git a/lisp/progmodes/fortran.el b/lisp/progmodes/fortran.el
index 01c4c09c954..43cb61cba6b 100644
--- a/lisp/progmodes/fortran.el
+++ b/lisp/progmodes/fortran.el
@@ -59,7 +59,8 @@
 (defvar gud-find-expr-function)
 (defvar imenu-case-fold-search)
 (defvar imenu-syntax-alist)
-
+(defvar comment-region-function)
+(defvar uncomment-region-function)
 
 (defgroup fortran nil
   "Major mode for editing fixed format Fortran code."
diff --git a/lisp/vc.el b/lisp/vc.el
index 1bc6aac856d..474c41c30ae 100644
--- a/lisp/vc.el
+++ b/lisp/vc.el
@@ -1930,9 +1930,7 @@ returns t if the buffer had changes, nil otherwise."
           (message "No changes between %s and %s" rev1-name rev2-name)
           nil)
       (pop-to-buffer (current-buffer))
-      ;; Gnus-5.8.5 sets up an autoload for diff-mode, even if it's
-      ;; not available.  Work around that.
-      (if (require 'diff-mode nil t) (diff-mode))
+      (diff-mode)
       (vc-exec-after `(vc-diff-sentinel ,verbose ,rev1-name ,rev2-name))
       ;; In the async case, we return t even if there are no differences
       ;; because we don't know that yet.
-- 
2.11.4.GIT