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    url => 'https://ftp.gnu.org/gnu/autoconf',
    filter => qr/^autoconf-.*\.tar\.gz$/,
    version => qr/([0-9\.]+)/,
  );
  plugin Extract => 'tar.gz',

  plugin 'Build::Autoconf' => ( msys_version => '0.08' );

  meta->before_hook(
    gather_share => sub {
      my($build) = @_;
      my $bin = Path::Tiny->new('bin');

      # patch executables
      foreach my $exe ($bin->children)
      {
        my($shebang, @lines) = $exe->lines;
        if($shebang =~ /^#!.*perl/)
        {
          @lines = (
            "BEGIN {\n",
            "  use strict;\n",
            "  use warnings;\n",
            "  use File::Spec;\n",
            "  my(\$v,\$d) = File::Spec->splitpath(File::Spec->rel2abs(__FILE__));\n",
            "  my \@d = File::Spec->splitdir(\$d);\n",
            "  pop \@d for 1..2;\n",
            "  my \$dist_dir = File::Spec->catpath(\$v,File::Spec->catdir(\@d), '');\n",
            "  \$ENV{AUTOM4TE}            ||= File::Spec->catfile(\$dist_dir, 'bin/autom4te');\n",
            "  \$ENV{autom4te_perllibdir} ||= File::Spec->catdir(\$dist_dir, 'share/autoconf');\n",
            "  \$ENV{AC_MACRODIR}         ||= File::Spec->catdir(\$dist_dir, 'share/autoconf');\n",
            "  \$ENV{AUTOCONF}            ||= File::Spec->catfile(\$dist_dir, 'bin/autoconf');\n",
            "  \$ENV{AUTOHEADER}          ||= File::Spec->catfile(\$dist_dir, 'bin/autoheader');\n",
            "  \$ENV{AUTOM4TE_CFG}        ||= File::Spec->catfile(\$dist_dir, 'share/autoconf/autom4te.blib.cfg')\n",
            "    if \$d[-5] eq 'lib' && \$d[-6] eq 'blib';\n",
            "  \$ENV{trailer_m4}          ||= File::Spec->catdir(\$dist_dir, 'share/autoconf/autoconf/trailer.m4');\n",
            "}\n",
            @lines
          );
          $exe->spew($shebang, @lines);
          $exe->chmod("0755");
        }
        elsif($shebang =~ /^#!.*sh/)
        {
          @lines = (
            ": \${AUTOM4TE=`alien_autoconf_root`'/bin/autom4te'}\n",
	    ": \${trailer_m4=`alien_autoconf_root`'/share/autoconf/autoconf/trailer.m4'}\n",
            @lines
          );
          $exe->spew($shebang, @lines);
          $exe->chmod("0755");
        }
      }

      # patch autom4te config
      {
        my $orig = Path::Tiny->new('share/autoconf/autom4te.cfg');
        my $new  = Path::Tiny->new('share/autoconf/autom4te.blib.cfg');
        my $stage = Path::Tiny->new($build->install_prop->{stage})->child('share/autoconf')->stringify;
        $orig->copy($new);
        $new->edit_lines(sub {
          s/--prepend-include '(.*)'/--prepend-include '$stage'/;
        });
      }

      # script to compute path to autoconf root
      {
        my $exe = Path::Tiny->new('bin/alien_autoconf_root');
        my $perl = $ENV{PERL} || '/usr/bin/perl';
        $exe->spew(
          "#!$perl\n",
          "use File::Spec;\n",
          "my(\$v,\$d) = File::Spec->splitpath(File::Spec->rel2abs(__FILE__));\n",
          "my \@d = File::Spec->splitdir(\$d);\n",
          "pop \@d for 1..2;\n",
          "my \$dist_dir = File::Spec->catpath(\$v,File::Spec->catdir(\@d), '');\n",
          "print \$dist_dir\n",
        );
        $exe->chmod('0700');
      }
    },
  );
};

#sys {
#
#  gather sub {
#    my($build) = @_;
#    $build->runtime_prop->{version} = $build->install_prop->{my_version};
#  };
#
#};