commit 13f00eb4493c217269b76614759e452d8302955e Author: Paul Eggert Date: Thu Mar 31 16:35:29 2016 -0700 automake: port to Perl 5.22 and later Without this change, Perl 5.22 complains "Unescaped left brace in regex is deprecated" and this is planned to become a hard error in Perl 5.26. See: http://search.cpan.org/dist/perl-5.22.0/pod/perldelta.pod#A_literal_%22{%22_should_now_be_escaped_in_a_pattern * bin/automake.in (substitute_ac_subst_variables): Escape left brace. --- automake.in | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/automake.in +++ b/automake.in @@ -4156,7 +4156,7 @@ 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; }