+\[Emacs 19.30 emulating function]"
+ (or (member element (symbol-value list-var))
+ (set list-var (cons element (symbol-value list-var)))
+ ))
+
+(cond ((fboundp 'insert-file-contents-literally)
+ )
+ ((boundp 'file-name-handler-alist)
+ (defun insert-file-contents-literally
+ (filename &optional visit beg end replace)
+ "Like `insert-file-contents', q.v., but only reads in the file.
+A buffer may be modified in several ways after reading into the buffer due
+to advanced Emacs features, such as file-name-handlers, format decoding,
+find-file-hooks, etc.
+ This function ensures that none of these modifications will take place.
+\[Emacs 19.30 emulating function]"
+ (let (file-name-handler-alist)
+ (insert-file-contents filename visit beg end replace)
+ ))
+ )
+ (t
+ (defalias 'insert-file-contents-literally 'insert-file-contents)
+ ))
+
+
+;;; @ Emacs 19.31 emulation
+;;;
+
+(defun-maybe buffer-live-p (object)
+ "Return non-nil if OBJECT is a buffer which has not been killed.
+Value is nil if OBJECT is not a buffer or if it has been killed.
+\[Emacs 19.31 emulating function]"
+ (and object
+ (get-buffer object)
+ (buffer-name (get-buffer object))
+ ))
+
+;; This macro was imported Emacs 19.33.
+(defmacro-maybe save-selected-window (&rest body)
+ "Execute BODY, then select the window that was selected before BODY.
+\[Emacs 19.31 emulating function]"
+ (list 'let
+ '((save-selected-window-window (selected-window)))
+ (list 'unwind-protect
+ (cons 'progn body)
+ (list 'select-window 'save-selected-window-window))))
+
+
+;;; @ Emacs 20.1 emulation
+;;;
+
+;; This macro was imported Emacs 20.2.
+(defmacro-maybe when (cond &rest body)
+ "(when COND BODY...): if COND yields non-nil, do BODY, else return nil."
+ (list 'if cond (cons 'progn body)))
+
+(defmacro-maybe save-current-buffer (&rest body)
+ "Save the current buffer; execute BODY; restore the current buffer.
+Executes BODY just like `progn'."
+ (` (let ((orig-buffer (current-buffer)))
+ (unwind-protect
+ (progn (,@ body))
+ (set-buffer orig-buffer)))))
+
+;; This macro was imported Emacs 20.2.
+(defmacro-maybe with-current-buffer (buffer &rest body)
+ "Execute the forms in BODY with BUFFER as the current buffer.
+The value returned is the value of the last form in BODY.
+See also `with-temp-buffer'."
+ (` (save-current-buffer
+ (set-buffer (, buffer))
+ (,@ body))))
+
+;; This macro was imported Emacs 20.2.
+(defmacro-maybe with-temp-buffer (&rest forms)
+ "Create a temporary buffer, and evaluate FORMS there like `progn'.
+See also `with-temp-file' and `with-output-to-string'."
+ (let ((temp-buffer (make-symbol "temp-buffer")))
+ (` (let (((, temp-buffer)
+ (get-buffer-create (generate-new-buffer-name " *temp*"))))
+ (unwind-protect
+ (with-current-buffer (, temp-buffer)
+ (,@ forms))
+ (and (buffer-name (, temp-buffer))
+ (kill-buffer (, temp-buffer))))))))
+
+;; This function was imported from XEmacs 21.
+(defun-maybe split-string (string &optional pattern)
+ "Return a list of substrings of STRING which are separated by PATTERN.
+If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
+ (or pattern
+ (setq pattern "[ \f\t\n\r\v]+"))
+ ;; The FSF version of this function takes care not to cons in case
+ ;; of infloop. Maybe we should synch?
+ (let (parts (start 0))
+ (while (string-match pattern string start)
+ (setq parts (cons (substring string start (match-beginning 0)) parts)
+ start (match-end 0)))
+ (nreverse (cons (substring string start) parts))))
+
+
+;;; @ Emacs 20.3 emulation
+;;;
+
+(defmacro-maybe string-as-unibyte (string)
+ "Return a unibyte string with the same individual bytes as STRING.
+If STRING is unibyte, the result is STRING itself.
+\[Emacs 20.3 emulating macro]"
+ string)
+
+(defmacro-maybe string-as-multibyte (string)
+ "Return a multibyte string with the same individual bytes as STRING.
+If STRING is multibyte, the result is STRING itself.
+\[Emacs 20.3 emulating macro]"
+ string)