[gtk/gtk-2-24: 1/2] m4macros: Set a serial number

[Emmanuele Bassi <ebassi src gnome org>]

commit acb78c9c6086f0d3a0eba06cc9becf2eb849e615
Author: Simon McVittie <smcv debian org>
Date:   Fri Apr 6 11:31:06 2018 +0100

    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    be overwritten, even if it is outdated.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>

 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 3c6b6dd8eb..a89477fabb 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