From: Simon McVittie <smcv@debian.org>
Date: Fri, 6 Apr 2018 11:31:06 +0100
Subject: m4macros: Set a serial number

When a project has a bundled copy of our macro included in tarball
source releases, typically in a m4/ or aclocal/ directory, aclocal
uses the serial number to determine whether the system copy in
/usr/share/aclocal is newer or older than the bundled copy. Without
a serial number, the bundled copy will always be used and will not
be overwritten, even if it is outdated.

Signed-off-by: Simon McVittie <smcv@debian.org>
Bug-Debian: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895018
Forwarded: https://gitlab.gnome.org/GNOME/gtk/merge_requests/104
Applied-upstream: 2.24.33, commit:acb78c9c6086f0d3a0eba06cc9becf2eb849e615
---
 m4macros/gtk-2.0.m4 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/m4macros/gtk-2.0.m4 b/m4macros/gtk-2.0.m4
index 3c6b6dd..a89477f 100644
--- a/m4macros/gtk-2.0.m4
+++ b/m4macros/gtk-2.0.m4
@@ -1,6 +1,10 @@
 # Configure paths for GTK+
 # Owen Taylor     1997-2001
 
+# Version number used by aclocal, see `info automake Serials`.
+# Increment on every change.
+#serial 1
+
 dnl AM_PATH_GTK_2_0([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND [, MODULES]]]])
 dnl Test for GTK+, and define GTK_CFLAGS and GTK_LIBS, if gthread is specified in MODULES, 
 dnl pass to pkg-config
