From 80ea6acbb957497825354cebe3452ce0c58e314e Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 8 Feb 2007 22:54:59 +0000
Subject: [PATCH] * zdiff.in: Don't use '((' in a shell script, as it's not
 portable to some ksh implementations, e.g., Solaris 10 ksh M-11/16/88i.
 Problem reported by Nelson H. F. Beebe in
 <http://lists.gnu.org/archive/html/bug-gzip/2007-02/msg00005.html>.

---
 ChangeLog | 7 +++++++
 zdiff.in  | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 7268929..efbadb3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2007-02-08  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* zdiff.in: Don't use '((' in a shell script, as it's not portable
+	to some ksh implementations, e.g., Solaris 10 ksh M-11/16/88i.
+	Problem reported by Nelson H. F. Beebe in
+	<http://lists.gnu.org/archive/html/bug-gzip/2007-02/msg00005.html>.
+
 2007-02-05  Paul Eggert  <eggert@cs.ucla.edu>
 
 	* NEWS: Version 1.3.11 released.
diff --git a/zdiff.in b/zdiff.in
index 1eeaa7e..fda3259 100644
--- a/zdiff.in
+++ b/zdiff.in
@@ -103,7 +103,7 @@ elif test $# -eq 2; then
 			gzip_status=$(
 			  exec 4>&1
 			  (gzip -cdfq -- "$1" 4>&-; echo $? >&4) 3>&- |
-			    ((gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
+			    ( (gzip -cdfq -- "$2" 4>&-; echo $? >&4) 3>&- 5<&- </dev/null |
 			       eval "$cmp" /dev/fd/5 -) 5<&0
 			)
 			case $gzip_status in
-- 
2.47.2