[gtk+] Deprecate AM_PATH_GTK_3_0 in favour of PKG_CHECK_MODULES

[Simon McVittie <smcv src gnome org>]

commit 169f064c1fa847830186ea14fe0e53b7178f1c07
Author: Simon McVittie <smcv debian org>
Date:   Wed Aug 6 11:23:23 2014 +0100

    Deprecate AM_PATH_GTK_3_0 in favour of PKG_CHECK_MODULES
    
    That's what GNOME applications use.
    
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=641638
    Bug-Debian: https://bugs.debian.org/756476
    Reviewed-by: Matthias Clasen

 m4macros/gtk-3.0.m4 |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/m4macros/gtk-3.0.m4 b/m4macros/gtk-3.0.m4
index 0d605fb..274cd32 100644
--- a/m4macros/gtk-3.0.m4
+++ b/m4macros/gtk-3.0.m4
@@ -6,7 +6,7 @@ dnl Test for GTK+, and define GTK_CFLAGS and GTK_LIBS, if gthread is specified i
 dnl pass to pkg-config
 dnl
 AC_DEFUN([AM_PATH_GTK_3_0],
-[dnl 
+[m4_warn([obsolete], [AM_PATH_GTK_3_0 is deprecated, use PKG_CHECK_MODULES([GTK], [gtk+-3.0]) instead])
 dnl Get the cflags and libraries from pkg-config
 dnl
 AC_ARG_ENABLE(gtktest, [  --disable-gtktest       do not try to compile and run a test GTK+ program],