diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index 38d330de6..f768a8233 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -901,7 +901,6 @@ attention to case differences."
 (defcustom org-imenu-depth 2
   "The maximum level for Imenu access to Org headlines.
 This also applied for speedbar access."
-  :group 'org-imenu-and-speedbar
   :type 'integer)
 
 ;;;; Imenu
@@ -1114,7 +1113,7 @@ ELEMENT is the element at point."
 
 ;;;; Bookmark
 
-(defun org-bookmark-jump-unhide ()
+(defun org-bookmark-jump-unhide (&rest _)
   "Unhide the current position, to show the bookmark location."
   (and (derived-mode-p 'org-mode)
        (or (org-invisible-p)
@@ -1123,7 +1122,7 @@ ELEMENT is the element at point."
        (org-show-context 'bookmark-jump)))
 
 ;; Make `bookmark-jump' shows the jump location if it was hidden.
-(add-hook 'bookmark-after-jump-hook 'org-bookmark-jump-unhide)
+(add-hook 'bookmark-after-jump-hook #'org-bookmark-jump-unhide)
 
 ;;;; Calendar
 
@@ -1176,42 +1175,29 @@ key."
 ;;;; Saveplace
 
 ;; Make sure saveplace shows the location if it was hidden
-(eval-after-load 'saveplace
-  '(defadvice save-place-find-file-hook (after org-make-visible activate)
-     "Make the position visible."
-     (org-bookmark-jump-unhide)))
+(advice-add 'save-place-find-file-hook :after #'org-bookmark-jump-unhide)
 
 ;;;; Ecb
 
 ;; Make sure ecb shows the location if it was hidden
-(eval-after-load 'ecb
-  '(defadvice ecb-method-clicked (after esf/org-show-context activate)
-     "Make hierarchy visible when jumping into location from ECB tree buffer."
-     (when (derived-mode-p 'org-mode)
-       (org-show-context))))
+(advice-add 'ecb-method-clicked :after #'org--ecb-show-context)
+(defun org--ecb-show-context (&rest _)
+  "Make hierarchy visible when jumping into location from ECB tree buffer."
+  (when (derived-mode-p 'org-mode)
+    (org-show-context)))
 
 ;;;; Simple
 
-(defun org-mark-jump-unhide ()
+(defun org-mark-jump-unhide (&rest _)
   "Make the point visible with `org-show-context' after jumping to the mark."
   (when (and (derived-mode-p 'org-mode)
 	     (org-invisible-p))
     (org-show-context 'mark-goto)))
 
-(eval-after-load 'simple
-  '(defadvice pop-to-mark-command (after org-make-visible activate)
-     "Make the point visible with `org-show-context'."
-     (org-mark-jump-unhide)))
+(advice-add 'pop-to-mark-command :after #'org-mark-jump-unhide)
 
-(eval-after-load 'simple
-  '(defadvice exchange-point-and-mark (after org-make-visible activate)
-     "Make the point visible with `org-show-context'."
-     (org-mark-jump-unhide)))
-
-(eval-after-load 'simple
-  '(defadvice pop-global-mark (after org-make-visible activate)
-     "Make the point visible with `org-show-context'."
-     (org-mark-jump-unhide)))
+(advice-add 'exchange-point-and-mark :after #'org-mark-jump-unhide)
+(advice-add 'pop-global-mark :after #'org-mark-jump-unhide)
 
 ;;;; Session
 
diff --git a/lisp/org-ctags.el b/lisp/org-ctags.el
index 6fc97ca39..59a08d0b5 100644
--- a/lisp/org-ctags.el
+++ b/lisp/org-ctags.el
@@ -157,7 +157,6 @@ See the ctags documentation for more information.")
 (defcustom org-ctags-path-to-ctags
   (if (executable-find "ctags-exuberant") "ctags-exuberant" "ctags")
   "Name of the ctags executable file."
-  :group 'org-ctags
   :version "24.1"
   :type 'file)
 
@@ -166,7 +165,6 @@ See the ctags documentation for more information.")
     org-ctags-ask-rebuild-tags-file-then-find-tag
     org-ctags-ask-append-topic)
   "List of functions to be prepended to ORG-OPEN-LINK-FUNCTIONS by ORG-CTAGS."
-  :group 'org-ctags
   :version "24.1"
   :type 'hook
   :options '(org-ctags-find-tag
@@ -188,7 +186,6 @@ Created as a local variable in each buffer.")
   "Text to insert when creating a new org file via opening a hyperlink.
 The following patterns are replaced in the string:
     `%t' - replaced with the capitalized title of the hyperlink"
-  :group 'org-ctags
   :version "24.1"
   :type 'string)
 
@@ -207,7 +204,8 @@ The following patterns are replaced in the string:
                   (visit-tags-table tags-filename))))))
 
 
-(defadvice visit-tags-table (after org-ctags-load-tag-list activate compile)
+(advice-add 'visit-tags-table :after #'org--ctags-load-tag-list)
+(defun org--ctags-load-tag-list (&rest _)
   (when (and org-ctags-enabled-p tags-file-name)
     (setq-local org-ctags-tag-list
 		(org-ctags-all-tags-in-current-tags-table))))
@@ -295,8 +293,9 @@ The new topic will be titled NAME (or TITLE if supplied)."
 ;;;; Misc interoperability with etags system =================================
 
 
-(defadvice xref-find-definitions
-    (before org-ctags-set-org-mark-before-finding-tag activate compile)
+(advice-add 'xref-find-definitions :before
+            #'org--ctags-set-org-mark-before-finding-tag)
+(defun org--ctags-set-org-mark-before-finding-tag (&rest _)
   "Before trying to find a tag, save our current position on org mark ring."
   (save-excursion
     (when (and (derived-mode-p 'org-mode) org-ctags-enabled-p)
diff --git a/lisp/org-mouse.el b/lisp/org-mouse.el
index 20c20acc3..2d8136b75 100644
--- a/lisp/org-mouse.el
+++ b/lisp/org-mouse.el
@@ -580,15 +580,17 @@ This means, between the beginning of line and the point."
   (insert text)
   (beginning-of-line))
 
-(defadvice dnd-insert-text (around org-mouse-dnd-insert-text activate)
+(advice-add 'dnd-insert-text :around #'org--mouse-dnd-insert-text)
+(defun org--mouse-dnd-insert-text (orig-fun window action text &rest args)
   (if (derived-mode-p 'org-mode)
       (org-mouse-insert-item text)
-    ad-do-it))
+    (apply orig-fun window action text args)))
 
-(defadvice dnd-open-file (around org-mouse-dnd-open-file activate)
+(advice-add 'dnd-open-file :around #'org--mouse-dnd-open-file)
+(defun org--mouse-dnd-open-file (orig-fun uri &rest args)
   (if (derived-mode-p 'org-mode)
       (org-mouse-insert-item uri)
-    ad-do-it))
+    (apply orig-fun uri args)))
 
 (defun org-mouse-match-closure (function)
   (let ((match (match-data t)))
@@ -894,15 +896,17 @@ This means, between the beginning of line and the point."
                   (1 `(face nil keymap ,org-mouse-map mouse-face highlight) prepend)))
                t))
 
-            (defadvice org-open-at-point (around org-mouse-open-at-point activate)
-              (let ((context (org-context)))
-                (cond
-                 ((assq :headline-stars context) (org-cycle))
-                 ((assq :checkbox context) (org-toggle-checkbox))
-                 ((assq :item-bullet context)
-                  (let ((org-cycle-include-plain-lists t)) (org-cycle)))
-                 ((org-footnote-at-reference-p) nil)
-                 (t ad-do-it))))))
+            (advice-add 'org-open-at-point :around #'org--mouse-open-at-point)))
+
+(defun org--mouse-open-at-point (orig-fun &rest args)
+  (let ((context (org-context)))
+    (cond
+     ((assq :headline-stars context) (org-cycle))
+     ((assq :checkbox context) (org-toggle-checkbox))
+     ((assq :item-bullet context)
+      (let ((org-cycle-include-plain-lists t)) (org-cycle)))
+     ((org-footnote-at-reference-p) nil)
+     (t (apply orig-fun args)))))
 
 (defun org-mouse-move-tree-start (_event)
   (interactive "e")
diff --git a/lisp/org-persist.el b/lisp/org-persist.el
index 3b6a2d330..dc14af817 100644
--- a/lisp/org-persist.el
+++ b/lisp/org-persist.el
@@ -179,7 +179,6 @@
                                        cache-dir))
                                    "org-persist/"))
   "Directory where the data is stored."
-  :group 'org-persist
   :type 'directory)
 
 (defcustom org-persist-remote-files 100
@@ -931,8 +930,8 @@ Also, remove containers associated with non-existing files."
       (message "Missing write access rights to org-persist-directory: %S"
                org-persist-directory)
     (add-hook 'kill-emacs-hook #'org-persist-write-all)
-    ;; `org-persist-gc' should run before `org-persist-write-all'.  So we are adding the
-    ;; hook after `org-persist-write-all'.
+    ;; `org-persist-gc' should run before `org-persist-write-all'.
+    ;; So we are adding the hook after `org-persist-write-all'.
     (add-hook 'kill-emacs-hook #'org-persist-gc)))
 
 (add-hook 'after-init-hook #'org-persist-load-all)
diff --git a/lisp/org-protocol.el b/lisp/org-protocol.el
index 7c4de03bc..1969f51fe 100644
--- a/lisp/org-protocol.el
+++ b/lisp/org-protocol.el
@@ -174,7 +174,6 @@ The filenames passed on the command line are passed to the emacs-server in
 reverse order.  Set to t (default) to re-reverse the list, i.e. use the
 sequence on the command line.  If nil, the sequence of the filenames is
 unchanged."
-  :group 'org-protocol
   :type 'boolean)
 
 (defcustom org-protocol-project-alist nil
@@ -233,7 +232,6 @@ Example:
 Consider using the interactive functions `org-protocol-create'
 and `org-protocol-create-for-org' to help you filling this
 variable with valid contents."
-  :group 'org-protocol
   :type 'alist)
 
 (defcustom org-protocol-protocol-alist nil
@@ -284,20 +282,17 @@ Here is an example:
         (\"your-protocol\"
          :protocol \"your-protocol\"
          :function your-protocol-handler-function)))"
-  :group 'org-protocol
   :type '(alist))
 
 (defcustom org-protocol-default-template-key nil
   "The default template key to use.
 This is usually a single character string but can also be a
 string with two characters."
-  :group 'org-protocol
   :type '(choice (const nil) (string)))
 
 (defcustom org-protocol-data-separator "/+\\|\\?"
   "The default data separator to use.
 This should be a single regexp string."
-  :group 'org-protocol
   :version "24.4"
   :package-version '(Org . "8.0")
   :type 'regexp)
@@ -309,7 +304,8 @@ This should be a single regexp string."
 Emacsclient compresses double and triple slashes."
   (when (string-match "^\\([a-z]+\\):/" uri)
     (let* ((splitparts (split-string uri "/+")))
-      (setq uri (concat (car splitparts) "//" (mapconcat 'identity (cdr splitparts) "/")))))
+      (setq uri (concat (car splitparts) "//"
+                        (mapconcat #'identity (cdr splitparts) "/")))))
   uri)
 
 (defun org-protocol-split-data (data &optional unhexify separator)
@@ -549,10 +545,10 @@ Now template ?b will be used."
   "Convert QUERY key=value pairs in the URL to a property list."
   (when query
     (let ((plus-decoded (replace-regexp-in-string "\\+" " " query t t)))
-      (apply 'append (mapcar (lambda (x)
-			       (let ((c (split-string x "=")))
-				 (list (intern (concat ":" (car c))) (cadr c))))
-			     (split-string plus-decoded "&"))))))
+      (cl-mapcan (lambda (x)
+		   (let ((c (split-string x "=")))
+		     (list (intern (concat ":" (car c))) (cadr c))))
+		 (split-string plus-decoded "&")))))
 
 (defun org-protocol-open-source (fname)
   "Process an org-protocol://open-source?url= style URL with FNAME.
@@ -641,7 +637,7 @@ Old-style links such as \"protocol://sub-protocol://param1/param2\" are
 also recognized.
 
 If a matching protocol is found, the protocol is stripped from
-fname and the result is passed to the protocol function as the
+FNAME and the result is passed to the protocol function as the
 first parameter.  The second parameter will be non-nil if FNAME
 uses key=val&key2=val2-type arguments, or nil if FNAME uses
 val/val2-type arguments.  If the function returns nil, the
@@ -687,12 +683,12 @@ to deal with new-style links.")
                     (throw 'fname t))))))))
       fname)))
 
-(defadvice server-visit-files (before org-protocol-detect-protocol-server activate)
+(advice-add 'server-visit-files :around #'org--protocol-detect-protocol-server)
+(defun org--protocol-detect-protocol-server (orig-fun files client &rest args)
   "Advice server-visit-flist to call `org-protocol-modify-filename-for-protocol'."
   (let ((flist (if org-protocol-reverse-list-of-files
-                   (reverse  (ad-get-arg 0))
-                 (ad-get-arg 0)))
-        (client (ad-get-arg 1)))
+                   (reverse files)
+                 files)))
     (catch 'greedy
       (dolist (var flist)
 	;; `\' to `/' on windows.  FIXME: could this be done any better?
@@ -701,11 +697,16 @@ to deal with new-style links.")
 		       fname (member var flist)  client))
           (if (eq fname t) ;; greedy? We need the t return value.
               (progn
-                (ad-set-arg 0 nil)
+                ;; FIXME: Doesn't this just ignore all the files before
+                ;; this one (the remaining ones have been passed to
+                ;; `org-protocol-check-filename-for-protocol' but not
+                ;; the ones before).
+                (setq files nil)
                 (throw 'greedy t))
             (if (stringp fname) ;; probably filename
                 (setcar var fname)
-              (ad-set-arg 0 (delq var (ad-get-arg 0))))))))))
+              (setq files (delq var files)))))))
+    (apply orig-fun files client args)))
 
 ;;; Org specific functions:
 
diff --git a/lisp/org-tempo.el b/lisp/org-tempo.el
index b34007bf7..ed7143175 100644
--- a/lisp/org-tempo.el
+++ b/lisp/org-tempo.el
@@ -67,7 +67,6 @@ just like `org-structure-template-alist'.  The tempo snippet
 
 Do not use \"I\" as a KEY, as it is reserved for expanding
 \"#+include\"."
-  :group 'org-tempo
   :type '(repeat (cons (string :tag "Key")
 		       (string :tag "Keyword")))
   :package-version '(Org . "9.2"))
@@ -102,8 +101,8 @@ Tempo templates will be added."
 
 Go through `org-structure-template-alist' and
 `org-tempo-keywords-alist' and update tempo templates."
-  (mapc 'org--check-org-structure-template-alist '(org-structure-template-alist
-						   org-tempo-keywords-alist))
+  (mapc #'org--check-org-structure-template-alist '(org-structure-template-alist
+						    org-tempo-keywords-alist))
   (let ((keys (org-tempo--keys)))
     ;; Check for duplicated snippet keys and warn if any are found.
     (when (> (length keys) (length (delete-dups keys)))
@@ -176,8 +175,8 @@ didn't succeed."
 ;; Org Tempo is set up with each new Org buffer and potentially in the
 ;; current Org buffer.
 
-(add-hook 'org-mode-hook 'org-tempo-setup)
-(add-hook 'org-tab-before-tab-emulation-hook 'org-tempo-complete-tag)
+(add-hook 'org-mode-hook #'org-tempo-setup)
+(add-hook 'org-tab-before-tab-emulation-hook #'org-tempo-complete-tag)
 
 ;; Enable Org Tempo in all open Org buffers.
 (dolist (b (org-buffer-list 'files))
diff --git a/lisp/org.el b/lisp/org.el
index 5e3d0b333..59714c171 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -8577,14 +8577,15 @@ This will temporarily bind local variables that are typically bound in
 Org mode to the values they have in Org mode, and then interactively
 call CMD."
   (org-load-modules-maybe)
-  (let (binds)
+  (let (vars vals)
     (dolist (var (org-get-local-variables))
       (when (or (not (boundp (car var)))
 		(eq (symbol-value (car var))
 		    (default-value (car var))))
-	(push (list (car var) `(quote ,(cadr var))) binds)))
-    (eval `(let ,binds
-	     (call-interactively (quote ,cmd))))))
+	(push (car var) vars)
+	(push (cadr var) vals)))
+    (cl-progv vars vals
+      (call-interactively cmd))))
 
 (defun org-get-category (&optional pos force-refresh)
   "Get the category applying to position POS."
@@ -9513,7 +9514,7 @@ block can be inserted by pressing TAB after the string \"<KEY\"."
 In particular, check if the Org 9.2 format is used as opposed to
 previous format."
   (let ((elm (cl-remove-if-not (lambda (x) (listp (cdr x)))
-			       (or (eval checklist)
+			       (or (symbol-value checklist)
 				   org-structure-template-alist))))
     (when elm
       (org-display-warning
@@ -12804,7 +12805,7 @@ a *different* entry, you cannot use these techniques."
 	    ;; Get the right scope
 	    (cond
 	     ((and scope (listp scope) (symbolp (car scope)))
-	      (setq scope (eval scope)))
+	      (setq scope (eval scope t)))
 	     ((eq scope 'agenda)
 	      (setq scope (org-agenda-files t)))
 	     ((eq scope 'agenda-with-archives)
@@ -14625,7 +14626,7 @@ Unless KEEPDATE is non-nil, update `org-ans2' to the cursor date."
   (let ((sf (selected-frame))
 	(sw (selected-window)))
     (select-window (get-buffer-window "*Calendar*" t))
-    (eval form)
+    (eval form t)
     (when (and (not keepdate) (calendar-cursor-to-date))
       (let* ((date (calendar-cursor-to-date))
 	     (time (encode-time 0 0 0 (nth 1 date) (nth 0 date) (nth 2 date))))
@@ -15039,9 +15040,9 @@ D may be an absolute day number, or a calendar-type list (month day year)."
   (let* ((sexp `(let ((entry ,entry)
 		      (date ',d))
 		  ,(car (read-from-string sexp))))
-	 (result (if calendar-debug-sexp (eval sexp)
+	 (result (if calendar-debug-sexp (eval sexp t)
 		   (condition-case nil
-		       (eval sexp)
+		       (eval sexp t)
 		     (error
 		      (beep)
 		      (message "Bad sexp at line %d in %s: %s"
@@ -15974,25 +15975,29 @@ in Org mode.
     (cdlatex-compute-tables))
   (unless org-cdlatex-texmathp-advice-is-done
     (setq org-cdlatex-texmathp-advice-is-done t)
-    (defadvice texmathp (around org-math-always-on activate)
-      "Always return t in Org buffers.
+    (advice-add 'texmathp :around #'org--math-always-on)))
+
+(defun org--math-always-on (orig-fun &rest args)
+  "Always return t in Org buffers.
 This is because we want to insert math symbols without dollars even outside
 the LaTeX math segments.  If Org mode thinks that point is actually inside
 an embedded LaTeX fragment, let `texmathp' do its job.
 `\\[org-cdlatex-mode-map]'"
-      (interactive)
-      (let (p)
-	(cond
-	 ((not (derived-mode-p 'org-mode)) ad-do-it)
-	 ((eq this-command 'cdlatex-math-symbol)
-	  (setq ad-return-value t
-		texmathp-why '("cdlatex-math-symbol in org-mode" . 0)))
-	 (t
-	  (let ((p (org-inside-LaTeX-fragment-p)))
-	    (if (and p (member (car p) (plist-get org-format-latex-options :matchers)))
-		(setq ad-return-value t
-		      texmathp-why '("Org mode embedded math" . 0))
-	      (when p ad-do-it)))))))))
+  (interactive)
+  (cond
+   ((not (derived-mode-p 'org-mode)) (apply orig-fun args))
+   ((eq this-command 'cdlatex-math-symbol)
+    (setq texmathp-why '("cdlatex-math-symbol in org-mode" . 0))
+    t)
+   (t
+    (let ((p (org-inside-LaTeX-fragment-p)))
+      (when p ;; FIXME: Shouldn't we return t when `p' is nil?
+	(if (member (car p)
+	            (plist-get org-format-latex-options :matchers))
+	    (progn
+	      (setq texmathp-why '("Org mode embedded math" . 0))
+	      t)
+	  (apply orig-fun args)))))))
 
 (defun turn-on-org-cdlatex ()
   "Unconditionally turn on `org-cdlatex-mode'."
@@ -16952,8 +16957,8 @@ overwritten, and the table is not marked as requiring realignment."
       (call-interactively org-speed-command))
      ((functionp org-speed-command)
       (funcall org-speed-command))
-     ((and org-speed-command (listp org-speed-command))
-      (eval org-speed-command))
+     ((consp org-speed-command)
+      (eval org-speed-command t))
      (t (let (org-use-speed-commands)
 	  (call-interactively 'org-self-insert-command)))))
    ((and
@@ -18781,7 +18786,8 @@ such private information before sending the email.")
 			    (string-match "\\(-hook\\|-function\\)\\'" (symbol-name v)))
 		       (and
 			(get v 'custom-type) (get v 'standard-value)
-			(not (equal (symbol-value v) (eval (car (get v 'standard-value)))))))
+			(not (equal (symbol-value v)
+			            (eval (car (get v 'standard-value)) t)))))
 		   (push v list)))))
 	 (kill-buffer (get-buffer "*Warn about privacy*"))
 	 list))
diff --git a/lisp/ox-odt.el b/lisp/ox-odt.el
index 7f2e8ba47..aa6e90122 100644
--- a/lisp/ox-odt.el
+++ b/lisp/ox-odt.el
@@ -362,7 +362,6 @@ When this option is turned on, `indent-region' is run on all
 component xml buffers before they are saved.  Turn this off for
 regular use.  Turn this on if you need to examine the xml
 visually."
-  :group 'org-export-odt
   :version "24.1"
   :type 'boolean)
 
@@ -399,7 +398,6 @@ with GNU ELPA tar or standard Emacs distribution."
   :type '(choice
 	  (const :tag "Not set" nil)
 	  (directory :tag "Schema directory"))
-  :group 'org-export-odt
   :version "24.1"
   :set
   (lambda (var value)
@@ -437,7 +435,6 @@ If unspecified, the file named \"OrgOdtContentTemplate.xml\"
 under `org-odt-styles-dir' is used."
   :type '(choice (const nil)
 		 (file))
-  :group 'org-export-odt
   :version "24.3")
 
 (defcustom org-odt-styles-file nil
@@ -471,7 +468,6 @@ a per-file basis.  For example,
 
 #+ODT_STYLES_FILE: \"/path/to/styles.xml\" or
 #+ODT_STYLES_FILE: (\"/path/to/file.ott\" (\"styles.xml\" \"image/hdr.png\"))."
-  :group 'org-export-odt
   :version "24.1"
   :type
   '(choice
@@ -486,7 +482,6 @@ a per-file basis.  For example,
 
 (defcustom org-odt-display-outline-level 2
   "Outline levels considered for enumerating captioned entities."
-  :group 'org-export-odt
   :version "24.4"
   :package-version '(Org . "8.0")
   :type 'integer)
@@ -516,7 +511,6 @@ specifiers are interpreted as below:
 %d output dir in full
 %D output dir as a URL.
 %x extra options as set in `org-odt-convert-capabilities'."
-  :group 'org-export-odt
   :version "24.1"
   :type
   '(choice
@@ -529,7 +523,6 @@ specifiers are interpreted as below:
   "Use this converter to convert from \"odt\" format to other formats.
 During customization, the list of converter names are populated
 from `org-odt-convert-processes'."
-  :group 'org-export-odt
   :version "24.1"
   :type '(choice :convert-widget
 		 (lambda (w)
@@ -591,7 +584,6 @@ format) to be converted to any of the export formats associated
 with that class.
 
 See default setting of this variable for a typical configuration."
-  :group 'org-export-odt
   :version "24.1"
   :type
   '(choice
@@ -618,7 +610,6 @@ variable, the list of valid values are populated based on
 
 You can set this option on per-file basis using file local
 values.  See Info node `(emacs) File Variables'."
-  :group 'org-export-odt
   :version "24.1"
   :type '(choice :convert-widget
 		 (lambda (w)
@@ -644,7 +635,6 @@ The function must accept two parameters:
 The function should return the string to be exported.
 
 The default value simply returns the value of CONTENTS."
-  :group 'org-export-odt
   :version "26.1"
   :package-version '(Org . "8.3")
   :type 'function)
@@ -664,7 +654,6 @@ TEXT      the main headline text (string).
 TAGS      the tags string, separated with colons (string or nil).
 
 The function result will be used as headline text."
-  :group 'org-export-odt
   :version "26.1"
   :package-version '(Org . "8.3")
   :type 'function)
@@ -685,7 +674,6 @@ The function must accept six parameters:
   CONTENTS  the contents of the inlinetask, as a string.
 
 The function should return the string to be exported."
-  :group 'org-export-odt
   :version "26.1"
   :package-version '(Org . "8.3")
   :type 'function)
@@ -712,7 +700,6 @@ nil            Ignore math snippets.
                be loaded.
 
 Any other symbol is a synonym for `mathjax'."
-  :group 'org-export-odt
   :version "24.4"
   :package-version '(Org . "8.0")
   :type '(choice
@@ -732,7 +719,6 @@ Any other symbol is a synonym for `mathjax'."
 A rule consists in an association whose key is the type of link
 to consider, and value is a regexp that will be matched against
 link's path."
-  :group 'org-export-odt
   :version "24.4"
   :package-version '(Org . "8.0")
   :type '(alist :key-type (string :tag "Type")
@@ -745,7 +731,6 @@ link's path."
 A rule consists in an association whose key is the type of link
 to consider, and value is a regexp that will be matched against
 link's path."
-  :group 'org-export-odt
   :version "26.1"
   :package-version '(Org . "8.3")
   :type '(alist :key-type (string :tag "Type")
@@ -756,7 +741,6 @@ link's path."
 Use this for sizing of embedded images.  See Info node `(org)
 Images in ODT export' for more information."
   :type 'float
-  :group 'org-export-odt
   :version "24.4"
   :package-version '(Org . "8.1"))
 
@@ -778,7 +762,6 @@ styles.xml already contains needed styles for colorizing to work.
 
 This variable is effective only if `org-odt-fontify-srcblocks' is
 turned on."
-  :group 'org-export-odt
   :version "24.1"
   :type 'boolean)
 
@@ -788,7 +771,6 @@ Turn this option on if you want to colorize the source code
 blocks in the exported file.  For colorization to work, you need
 to make available an enhanced version of `htmlfontify' library."
   :type 'boolean
-  :group 'org-export-odt
   :version "24.1")
 
 
@@ -873,7 +855,6 @@ implementation filed under `org-odt-get-table-cell-styles'.
 The TABLE-STYLE-NAME \"OrgEquation\" is used internally for
 formatting of numbered display equations.  Do not delete this
 style from the list."
-  :group 'org-export-odt
   :version "24.1"
   :type '(choice
           (const :tag "None" nil)
@@ -918,7 +899,6 @@ document by setting the default language and country either using
 the application UI or through a custom styles file.
 
 See `org-odt--build-date-styles' for implementation details."
-  :group 'org-export-odt
   :version "24.4"
   :package-version '(Org . "8.0")
   :type 'boolean)
@@ -2005,14 +1985,16 @@ information."
 
 ;;;; Latex Environment
 
-
 ;; (eval-after-load 'ox-odt '(ad-deactivate 'org-format-latex-as-mathml))
-;; (defadvice org-format-latex-as-mathml	; FIXME
-;;   (after org-odt-protect-latex-fragment activate)
+;; (advice-add 'org-format-latex-as-mathml	; FIXME
+;;   :around #'org--odt-protect-latex-fragment)
+;; (defun org--odt-protect-latex-fragment (orig-fun latex-frag &rest args)
 ;;   "Encode LaTeX fragment as XML.
 ;; Do this when translation to MathML fails."
-;;   (unless (> (length ad-return-value) 0)
-;;     (setq ad-return-value (org-odt--encode-plain-text (ad-get-arg 0)))))
+;;   (let ((retval (apply orig-fun latex-frag args)))
+;;     (if (> (length retval) 0)
+;;         retval
+;;       (org-odt--encode-plain-text latex-frag))))
 
 (defun org-odt-latex-environment (latex-environment _contents info)
   "Transcode a LATEX-ENVIRONMENT element from Org to ODT.