From 0a6a483c1c6e0be5f64d0e1c262e4145b297b722 Mon Sep 17 00:00:00 2001
From: Simon McQueen <simon.mcqueen@microfocus.com>
Date: Wed, 31 Aug 2022 10:52:06 +0100
Subject: Fix a small part of commit e401f02ed7c5 which broke compilation with
 Perl 5.8.8. This syntax seemingly post-dates that version.

---
 ACE/bin/PerlACE/Process_Unix.pm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ACE/bin/PerlACE/Process_Unix.pm b/ACE/bin/PerlACE/Process_Unix.pm
index 9a9a25e996c..79365970451 100644
--- a/ACE/bin/PerlACE/Process_Unix.pm
+++ b/ACE/bin/PerlACE/Process_Unix.pm
@@ -874,7 +874,11 @@ sub check_return_value ($)
 {
     my $self = shift;
     my $rc = shift;
-    my $opts = shift // {};
+    my $opts = shift;
+
+    if (! defined $opts) {
+        $opts = {};
+    }
 
     # NSK OSS has a 32-bit waitpid() status
     my $is_NSK = ($^O eq "nonstop_kernel");
-- 
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