--- bin/automake.orig	2016-10-08 13:34:06.755669580 -0400
+++ bin/automake	2016-10-09 05:08:14.020424529 -0400
@@ -3933,7 +3933,7 @@
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$\{([^ \t=:+{}]+)\}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }