[gtkglarea] configure.ac: Use AM_SILENT_RULES to enable silent rules

[Javier Jardón <jjardon src gnome org>]

commit 014c130984748f5d52ad653a2294039f6aaae71b
Author: Javier Jardón <jjardon gnome org>
Date:   Thu Feb 27 02:42:26 2014 +0000

    configure.ac: Use AM_SILENT_RULES to enable silent rules
    
    Support silent build rules, requires at least automake-1.11.
    Disable by either passing --disable-silent-rules to configure or
    passing V=1 to make.

 configure.ac |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9a4b0b5..6cdb0c9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -5,8 +5,12 @@ AC_CONFIG_AUX_DIR(.auto)
 AC_CONFIG_HEADER(config.h)
 AC_CONFIG_MACRO_DIR([m4])
 
-AM_INIT_AUTOMAKE([no-define])
+AM_INIT_AUTOMAKE([1.11 no-define])
 AM_MAINTAINER_MODE([enable])
+# Support silent build rules, requires at least automake 1.11. Disable
+# by either passing --disable-silent-rules to configure or passing V=1
+# to make
+AM_SILENT_RULES([yes])
 
 #shared library versioning
 GTKGL_LIBRARY_VERSION=1:1:0