From: Pavel Raiskup <praiskup@redhat.com>
Date: Tue, 7 Jul 2015 10:54:24 +0200
Subject: [PATCH 2/2] bin/automake: escape '{' in regexp pattern

Resolves: rhbz#1239379
Upstream report:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=21001

diff --git a/automake.in b/automake.in
index eedc8bc..a679d16 100644
--- a/automake.in
+++ b/automake.in
@@ -3932,7 +3932,7 @@ sub substitute_ac_subst_variables_worker
 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;
 }