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+From 13f00eb4493c217269b76614759e452d8302955e Mon Sep 17 00:00:00 2001
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+From: Paul Eggert <eggert@cs.ucla.edu>
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+Date: Thu, 31 Mar 2016 16:35:29 -0700
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+Subject: [PATCH] automake: port to Perl 5.22 and later
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+
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+Without this change, Perl 5.22 complains "Unescaped left brace in
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+regex is deprecated" and this is planned to become a hard error in
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+Perl 5.26. See:
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+http://search.cpan.org/dist/perl-5.22.0/pod/perldelta.pod#A_literal_%22{%22_should_now_be_escaped_in_a_pattern
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+* bin/automake.in (substitute_ac_subst_variables): Escape left brace.
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+---
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+ bin/automake.in | 2 +-
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+ 1 file changed, 1 insertion(+), 1 deletion(-)
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+
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+diff --git a/bin/automake.in b/bin/automake.in
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+index a3a0aa318..2c8f31e14 100644
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+--- a/bin/automake.in
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++++ b/bin/automake.in
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+@@ -3878,7 +3878,7 @@ sub substitute_ac_subst_variables_worker
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+ sub substitute_ac_subst_variables
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+ {
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+ my ($text) = @_;
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+- $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
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++ $text =~ s/\$[{]([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
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+ return $text;
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+ }
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+
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+--
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+2.13.1
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+
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