Subject: http://comments.gmane.org/gmane.comp.lib.gnulib.bugs/35272

Index: grep-2.21/build-aux/update-copyright
===================================================================
--- grep-2.21.orig/build-aux/update-copyright
+++ grep-2.21/build-aux/update-copyright
@@ -124,7 +124,7 @@ use strict;
 use warnings;
 
 my $copyright_re = 'Copyright';
-my $circle_c_re = '(?:\([cC]\)|@copyright{}|©)';
+my $circle_c_re = '(?:\([cC]\)|@copyright\{}|©)';
 my $holder = $ENV{UPDATE_COPYRIGHT_HOLDER};
 $holder ||= 'Free Software Foundation, Inc.';
 my $prefix_max = 5;