* lisp/org-compat: add org-assoc-delete-all from compat/compat-27.el
* lisp/org-persist: use org-assoc-delete-all
---
  lisp/org-compat.el  | 18 ++++++++++++++++++
  lisp/org-persist.el |  2 +-
  2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/lisp/org-compat.el b/lisp/org-compat.el
index 8b1f16355..6fcea1837 100644
--- a/lisp/org-compat.el
+++ b/lisp/org-compat.el
@@ -348,6 +348,24 @@ Execute BODY, and unwind connection-local variables."
      `(with-connection-local-profiles (connection-local-get-profiles nil)
         ,@body)))

+;; assoc-delete-all missing from 26.1
+(if (fboundp 'assoc-delete-all)
+    (defalias 'org-assoc-delete-all 'assoc-delete-all)
+  ;; from compat/compat-27.el
+  (defun org-assoc-delete-all (key alist &optional test)
+    "Delete all matching key from alist, default test equal"
+    (unless test (setq test #'equal))
+    (while (and (consp (car alist))
+        (funcall test (caar alist) key))
+      (setq alist (cdr alist)))
+    (let ((tail alist) tail-cdr)
+      (while (setq tail-cdr (cdr tail))
+    (if (and (consp (car tail-cdr))
+         (funcall test (caar tail-cdr) key))
+            (setcdr tail (cdr tail-cdr))
+          (setq tail tail-cdr))))
+    alist))
+
  
  ;;; Emacs < 26.1 compatibility

diff --git a/lisp/org-persist.el b/lisp/org-persist.el
index 82c31144a..229957fb0 100644
--- a/lisp/org-persist.el
+++ b/lisp/org-persist.el
@@ -1216,7 +1216,7 @@ Remove expired sessions timestamps."
  Remove current sessions from `org-persist-gc-lock-file'."
    (let* ((file (org-file-name-concat org-persist-directory 
org-persist-gc-lock-file))
           (alist (when (file-exists-p file) 
(org-persist--read-elisp-file file))))
-    (setq alist (assoc-delete-all before-init-time alist))
+    (setq alist (org-assoc-delete-all before-init-time alist))
      (org-persist--write-elisp-file file alist)
      ;; Only GC orphan files when there are no active sessions.
      (not alist)))

base-commit: 80ce6152ba915b7c53d239f2b030f7afb8e70e8e
-- 
2.20.1