From: Stephane Glondu <steph@glondu.net>
Date: Fri, 6 Sep 2019 09:53:22 +0200
Subject: Fix compilation with OCaml 4.08.0

---
 web.ml | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/web.ml b/web.ml
index 7dc1470..6f9ca51 100644
--- a/web.ml
+++ b/web.ml
@@ -247,14 +247,16 @@ let norm_string s =
 
 let alpha_string s1 s2 =
   match what_is_first_char s1, what_is_first_char s2 with
-    | Symbol, Symbol -> s1 < s2
-    | Symbol, _ -> true
-    | _, Symbol -> false
-    | _,_ -> norm_string s1 < norm_string s2
+    | Symbol, Symbol -> compare s1 s2
+    | Symbol, _ -> -1
+    | _, Symbol -> 1
+    | _,_ -> compare (norm_string s1) (norm_string s2)
+
+let ( ++ ) c1 c2 =
+  if c1 = 0 then c2 else c1
 
 let order_entry e1 e2 =
-  (alpha_string e1.e_name e2.e_name) ||
-  (e1.e_name = e2.e_name && e1.e_type < e2.e_type)
+  alpha_string e1.e_name e2.e_name ++ compare e1.e_type e2.e_type
 
 (*s The following function collects all the index entries and sort them
     using [alpha_string], returning a list. *)
@@ -264,7 +266,7 @@ module Idset = Set.Make(struct type t = index_entry let compare = compare end)
 let all_entries () =
   let s = Idmap.fold (fun x _ s -> Idset.add x s) !used Idset.empty in
   let s = Idmap.fold (fun x _ s -> Idset.add x s) !defined s in
-  Sort.list order_entry (Idset.elements s)
+  List.sort order_entry (Idset.elements s)
 
 
 (*s When we are in \LaTeX\ style, an index entry only consists in two lists
@@ -324,7 +326,7 @@ let list_in_table id t =
   try
     let l = Whereset.elements (Idmap.find id t) in
     let l = map_succeed_nf find_where l in
-    let l = Sort.list (fun x x' -> snd x < snd x') l in
+    let l = List.sort (fun x x' -> compare (snd x) (snd x')) l in
     uniquize l
   with Not_found ->
     []