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  plugin Extract => 'tar.gz';

  patch sub {
    my($build) = @_;

    # https://git.savannah.gnu.org/cgit/automake.git/commit/configure.ac?id=ccb57553e3433df3e52e534e6f87915db23ff9a5
    Path::Tiny->new('configure')->edit_lines(sub {
      my $replace = <<'EOF';
printf '%s\n' > conftest/conftest.ac \
  'AC''_INIT([smoke-test], [1])' \
  'AC''_OUTPUT'
EOF
      s{echo 'AC''_INIT' > conftest/conftest.ac}{$replace};
      $replace = <<'END_OF_PATCH';
printf '%s\n' > conftest/conftest.ac \
  'AC'"_PREREQ([$required_autoconf_version])" \
  'AC''_INIT([smoke-test], [1])' \
  'AC''_OUTPUT'
END_OF_PATCH
      s{echo 'AC'"_PREREQ\(\[\$required_autoconf_version\]\)" > conftest/conftest.ac}{$replace};
    });
    Path::Tiny->new('configure')->chmod(0755);

    # https://debbugs.gnu.org/cgi/bugreport.cgi?bug=20903
    # bug in automake: it puts the @datadir@ in double quotes
    # in one place in bin/aclocal, which causes Perl to barf
    # if prefix has an at sign (@) in it.  This is commonly
    # the case when using perlbrew.