Fix for http://debbugs.gnu.org/cgi/bugreport.cgi?bug=9928

diff -ru automake-1.11.1-orig/automake.in automake-1.11.1/automake.in
--- automake-1.11.1-orig/automake.in	2009-12-08 13:15:40.000000000 -0500
+++ automake-1.11.1/automake.in	2011-11-01 02:18:47.000000000 -0400
@@ -1162,8 +1162,8 @@
     if (option 'silent-rules')
       {
 	# Using `$V' instead of `$(V)' breaks IRIX make.
-	define_variable ($var, '$(' . $pvar . '_$(V))', INTERNAL);
-	define_variable ($pvar . '_', '$(' . $pvar . '_$(AM_DEFAULT_VERBOSITY))', INTERNAL);
+	define_variable ($var, '$(' . $pvar . '_${V})', INTERNAL);
+	define_variable ($pvar . '_', '$(' . $pvar . '_${AM_DEFAULT_VERBOSITY})', INTERNAL);
 	Automake::Variable::define ($silent_var, VAR_AUTOMAKE, '', TRUE, $val,
 				    '', INTERNAL, VAR_ASIS)
 	  if (! vardef ($silent_var, TRUE));