diff --git a/gtk-doc.changes b/gtk-doc.changes
index 5442528..02f3f42 100644
--- a/gtk-doc.changes
+++ b/gtk-doc.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Thu Jun 29 08:14:06 UTC 2017 - bwiedemann@suse.com
+
+- Add reproducible.patch to sort input file lists
+  to fix indeterminism in gstreamer and vte html docs (bgo#784177).
+
 -------------------------------------------------------------------
 Wed Jun  1 16:53:10 UTC 2016 - jengelh@inai.de
 
diff --git a/gtk-doc.spec b/gtk-doc.spec
index 6f5faae..0c2c0c6 100644
--- a/gtk-doc.spec
+++ b/gtk-doc.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package gtk-doc
 #
-# Copyright (c) 2016 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2017 SUSE LINUX GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -24,6 +24,8 @@ License:        GPL-2.0+
 Group:          Productivity/Publishing/SGML
 Url:            http://www.gtk.org/gtk-doc/
 Source:         http://download.gnome.org/sources/gtk-doc/1.25/%{name}-%{version}.tar.xz
+# PATCH-FIX-UPSTREAM reproducible.patch bgo#784177 bwiedemann@suse.com -- Sort input file lists
+Patch0:         reproducible.patch
 # When updating this package, please don't forget to update the gtk-doc.m4 Source
 # in glib2.
 BuildRequires:  docbook-xsl-stylesheets
@@ -56,6 +58,7 @@ generate the documentation for GLib, Gtk+, and GNOME.
 %lang_package
 %prep
 %setup -q
+%patch0 -p1
 
 %build
 %configure --disable-scrollkeeper
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..f1cd021
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,79 @@
+sort directory listings
+
+because ordering matters in some places
+when we want to generate reproducible results
+
+to fix https://bugzilla.gnome.org/show_bug.cgi?id=784177
+
+See also https://reproducible-builds.org/docs/stable-inputs/ on that topic
+
+Index: gtk-doc-1.25/gtkdoc-scan.in
+===================================================================
+--- gtk-doc-1.25.orig/gtkdoc-scan.in
++++ gtk-doc-1.25/gtkdoc-scan.in
+@@ -223,7 +223,7 @@ sub ScanHeaders {
+     opendir (SRCDIR, $source_dir)
+         || die "Can't open source directory $source_dir: $!";
+     my $file;
+-    foreach $file (readdir (SRCDIR)) {
++    foreach $file (sort (readdir (SRCDIR))) {
+         if ($file eq '.' || $file eq '..' || $file =~ /^\./) {
+             next;
+         } elsif (-d "$source_dir/$file") {
+Index: gtk-doc-1.25/gtkdoc-fixxref.in
+===================================================================
+--- gtk-doc-1.25.orig/gtkdoc-fixxref.in
++++ gtk-doc-1.25/gtkdoc-fixxref.in
+@@ -204,7 +204,7 @@ sub ScanIndices {
+ 
+     opendir (HTMLDIR, $scan_dir) || return;
+     my $file;
+-    foreach $file (readdir (HTMLDIR)) {
++    foreach $file (sort (readdir (HTMLDIR))) {
+         if ($file eq '.' || $file eq '..') {
+             next;
+         } elsif (-d "$scan_dir/$file") {
+@@ -323,7 +323,7 @@ sub FixCrossReferences {
+     opendir (HTMLDIR, $scan_dir)
+         || die "Can't open HTML directory $scan_dir: $!";
+     my $file;
+-    foreach $file (readdir (HTMLDIR)) {
++    foreach $file (sort (readdir (HTMLDIR))) {
+         if ($file eq '.' || $file eq '..') {
+             next;
+         } elsif ($file =~ m/.html?$/) {
+Index: gtk-doc-1.25/gtkdoc-mkdb.in
+===================================================================
+--- gtk-doc-1.25.orig/gtkdoc-mkdb.in
++++ gtk-doc-1.25/gtkdoc-mkdb.in
+@@ -3900,7 +3900,7 @@ sub ReadSourceDocumentation {
+     opendir (SRCDIR, $source_dir)
+         || die "Can't open source directory $source_dir: $!";
+ 
+-    foreach $file (readdir (SRCDIR)) {
++    foreach $file (sort (readdir (SRCDIR))) {
+       if ($file =~ /^\./) {
+         next;
+       } elsif (-d "$source_dir/$file") {
+Index: gtk-doc-1.25/gtkdoc-rebase.in
+===================================================================
+--- gtk-doc-1.25.orig/gtkdoc-rebase.in
++++ gtk-doc-1.25/gtkdoc-rebase.in
+@@ -157,7 +157,7 @@ sub ScanDirectory {
+     my $file;
+     my $onlinedir;
+     my $have_index = 0;
+-    foreach $file (readdir(HTMLDIR)) {
++    foreach $file (sort (readdir(HTMLDIR))) {
+         if ($file eq '.' or $file eq '..') {
+             next;
+         }
+@@ -291,7 +291,7 @@ sub RebaseReferences {
+     my ($dir) = @_;
+ 
+     opendir(HTMLDIR, $dir) || die "Can't open HTML directory $dir: $!";
+-    foreach my $file (readdir(HTMLDIR)) {
++    foreach my $file (sort (readdir(HTMLDIR))) {
+         if ($file =~ m/\.html?$/) {
+             &RebaseFile("$dir$file");
+         }