Turn on automake silent rules if supported

configure.in.in

@@ -10,6 +10,8 @@ dnl init autoconf
 AC_INIT([xfce4-dict], [dict_version], [http://bugzilla.xfce.org/])
 AC_PREREQ([2.50])
 
+m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
+
 dnl init automake
 DICT_VERSION=dict_version
 AM_INIT_AUTOMAKE([xfce4-dict], [$DICT_VERSION])