Depend on seq-2.24 for seq-keep

Author: tarsius

elx.el

@@ -10,7 +10,11 @@
 ;; Keywords: docs libraries packages
 
 ;; Package-Version: 2.2.0
-;; Package-Requires: ((emacs "26.1") (compat "30.0.2.0") (llama "0.6.1"))
+;; Package-Requires: (
+;;     (emacs "26.1")
+;;     (compat "30.0.2.0")
+;;     (llama "0.6.1")
+;;     (seq "2.24"))
 
 ;; SPDX-License-Identifier: GPL-3.0-or-later
 
@@ -45,9 +49,16 @@
 (require 'lisp-mnt)
 (require 'llama)
 (require 'package)
-(require 'seq)
 (require 'subr-x)
 
+;; For older Emacs releases we depend on an updated `seq' release from GNU
+;; ELPA, for `seq-keep'.  Unfortunately something else may require `seq'
+;; before `package' had a chance to put this version on the `load-path'.
+(when (and (featurep 'seq)
+           (not (fboundp 'seq-keep)))
+  (unload-feature 'seq 'force))
+(require 'seq)
+
 (defgroup elx nil
   "Extract information from Emacs Lisp libraries."
   :group 'maint