From <https://bugs.debian.org/801523>.

From c01f602d1926b0671fd2c8d91f7e52c4e4c9fb24 Mon Sep 17 00:00:00 2001
From: Niko Tyni <ntyni@debian.org>
Date: Sun, 11 Oct 2015 19:27:56 +0300
Subject: [PATCH] Sort the list of XS code files when generating RealPPPort.xs

all_files_in_dir() uses readdir() ordering to make the list of
input files. This can vary between build systems, breaking build
reproducibility.
---
 cpan/Devel-PPPort/PPPort_xs.PL | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpan/Devel-PPPort/PPPort_xs.PL b/cpan/Devel-PPPort/PPPort_xs.PL
index 5f18940..149f2fe 100644
--- a/cpan/Devel-PPPort/PPPort_xs.PL
+++ b/cpan/Devel-PPPort/PPPort_xs.PL
@@ -38,7 +38,7 @@ END
 my $file;
 my $sec;
 
-for $file (all_files_in_dir('parts/inc')) {
+for $file (sort(all_files_in_dir('parts/inc'))) {
   my $spec = parse_partspec($file);
 
   my $msg = 0;
-- 
2.5.1