on GNU/Cygwin32 at least, “env” does not display its output sorted;

make sort(1) presence a conditional though

check.t

@@ -1,4 +1,4 @@
-# $MirOS: src/bin/mksh/check.t,v 1.261 2009/03/17 13:56:46 tg Exp $
+# $MirOS: src/bin/mksh/check.t,v 1.262 2009/03/21 11:09:35 tg Exp $
 # $OpenBSD: bksl-nl.t,v 1.2 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: history.t,v 1.5 2001/01/28 23:04:56 niklas Exp $
 # $OpenBSD: read.t,v 1.3 2003/03/10 03:48:16 david Exp $
@@ -4023,8 +4023,9 @@ description:
 	Check to make sure exec doesn't change environment if a program
 	isn't exec-ed
 stdin:
-	env > bar1
-	FOO=bar exec; env > bar2
+	sortprog=$(whence -p sort) || sortprog=cat
+	env | $sortprog >bar1
+	FOO=bar exec; env | $sortprog >bar2
 	cmp -s bar1 bar2
 ---
 name: xxx-what-do-you-call-this-1