[gdl] Enable pretty automake build.

[Naba Kumar <naba src gnome org>]

commit e2b7e1cdba1fbee56dbec96838e18a8267e90fce
Author: Naba Kumar <naba gnome org>
Date:   Sat Feb 13 12:21:23 2010 +0200

    Enable pretty automake build.

 configure.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/configure.in b/configure.in
index 60ed072..88a6b48 100644
--- a/configure.in
+++ b/configure.in
@@ -55,6 +55,7 @@ AC_SUBST(GTK_REQUIRED)
 AC_SUBST(XML_REQUIRED)
 
 AM_MAINTAINER_MODE
+m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
 
 AC_ISC_POSIX
 AC_PROG_CC