Example with \\labelcpageref needs :backref-sep

org-glossary.el

@@ -242,6 +242,7 @@ command like so is recommended:
 
   (org-glossary-set-export-spec 'latex t
     :backref \"gls-%k-use-%r\"
+    :backref-seperator \",\"
     :definition-structure
     \"*%d*\\emsp{}%v\\ensp{}@@latex:\\ifnum%n>0 \\labelcpageref{@@%b@@latex:}\\fi@@\n\")
 

org-glossary.org

@@ -555,6 +555,7 @@ instead make use of ~setcdr~ or ~plist-put~ like so:
 #+begin_example
 (org-glossary-set-export-spec 'latex t
   :backref "gls-%k-use-%r"
+  :backref-seperator ","
   :definition-structure "*%d*\\emsp{}%v\\ensp{}@@latex:\\ifnum%n>0 \\labelcpageref{@@%b@@latex:}\\fi@@\n")
 #+end_example
 

org-glossary.texi

@@ -743,6 +743,7 @@ instead make use of @code{setcdr} or @code{plist-put} like so:
 @example
 (org-glossary-set-export-spec 'latex t
   :backref "gls-%k-use-%r"
+  :backref-seperator ","
   :definition-structure "*%d*\\emsp@{@}%v\\ensp@{@}@@@@latex:\\ifnum%n>0 \\labelcpageref@{@@@@%b@@@@latex:@}\\fi@@@@\n")
 @end example