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        $archive = $self->fetch_file([$url], $sha1, $download)
            || die "###ERROR### Download failed\n";
      }
      print STDERR "Checking checksum '$archive'...\n";

      #extract source codes
      my $extract_src = 'y';
      if (lc($extract_src) eq 'y') {
        my $ae = Archive::Extract->new( archive => $archive );
        $ae->extract(to => $build_src) || die "###ERROR### Cannot extract tarball ", $ae->error;
        die "###ERROR### Cannot find expected dir='",$self->notes('src_dir'),"'"
             unless -d $self->notes('src_dir');
      }

      $self->prebuild if $self->can('prebuild');
      $self->build_binaries if $self->can('build_binaries');
	  $self->preinstall_binaries($build_out);

      $self->config_data('share_subdir', $self->{properties}->{dist_version});
      $self->config_data('config', {
          PREFIX => '@PrEfIx@',
          libs   => '-L' . $self->quote_literal('@PrEfIx@/lib') . ' -lAntTweakBar',
          cflags => '-I' . $self->quote_literal('@PrEfIx@/include'),
      });
    }
    # mark sucessfully finished build
    local @ARGV = ('build_done');
    ExtUtils::Command::touch;
  }
  $self->SUPER::ACTION_code;
}

sub fetch_file {
  my ($self, $url_list, $sha1sum, $download) = @_;
  die "###ERROR### _fetch_file undefined url\n" unless $url_list;
  die "###ERROR### _fetch_file undefined sha1sum\n" unless $sha1sum;
  for my $url (@$url_list) {
    my $ff = File::Fetch->new(uri => $url);
    my $fn = catfile($download, $ff->file);
    if (-e $fn) {
      print STDERR "Checking checksum for already existing '$fn'...\n";
      return $fn if $self->check_sha1sum($fn, $sha1sum);
      unlink $fn; #exists but wrong checksum
    }
    print STDERR "Fetching '$url' ...\n";
    my $fullpath = $ff->fetch(to => $download);
    if ($fullpath && -e $fullpath && $self->check_sha1sum($fullpath, $sha1sum)) {
      print STDERR "Download OK (filesize=".(-s $fullpath).")\n";
      return $fullpath;
    }
    warn "###WARNING### Unable to fetch '$url'\n";
  }
  return;
}

sub check_sha1sum {
  my ($self, $file, $sha1sum) = @_;
  my $sha1 = Digest::SHA->new;
  my $fh;
  open($fh, $file) or die "###ERROR## Cannot check checksum for '$file'\n";
  binmode($fh);
  $sha1->addfile($fh);
  close($fh);
  my $rv = ($sha1->hexdigest eq $sha1sum) ? 1 : 0;
  warn "###WARN## sha1 mismatch: got      '", $sha1->hexdigest , "'\n",
       "###WARN## sha1 mismatch: expected '", $sha1sum, "'\n",
       "###WARN## sha1 mismatch: filesize '", (-s $file), "'\n", unless $rv;
  return $rv;
}

sub clean_dir {
  my( $self, $dir ) = @_;
  if (-d $dir) {
    File::Path::rmtree($dir);
    File::Path::mkpath($dir);
  }
}

sub quote_literal {
  # this can be be overriden in My::Builder::<platform>
  my ($self, $path) = @_;
  return $path;
}

# pure perl implementation of patch functionality
sub apply_patch {
  my ($self, $dir_to_be_patched, $patch_file) = @_;
  my ($src, $diff);

  undef local $/;
  open(DAT, $patch_file) or die "###ERROR### Cannot open file: '$patch_file'\n";
  $diff = <DAT>;
  close(DAT);
  $diff =~ s/\r\n/\n/g; #normalise newlines
  $diff =~ s/\ndiff /\nSpLiTmArKeRdiff /g;
  my @patches = split('SpLiTmArKeR', $diff);

  print STDERR "Applying patch file: '$patch_file'\n";
  foreach my $p (@patches) {
    my ($k) = map{$_ =~ /\n---\s*([\S]+)/} $p;
    # doing the same like -p1 for 'patch'
    $k =~ s|\\|/|g;
    $k =~ s|^[^/]*/(.*)$|$1|;
    $k = catfile($dir_to_be_patched, $k);
    print STDERR "- gonna patch '$k'\n" if $self->notes('build_debug_info');

    open(SRC, $k) or die "###ERROR### Cannot open file: '$k'\n";
    $src  = <SRC>;
    close(SRC);
    $src =~ s/\r\n/\n/g; #normalise newlines

    my $out = eval { Text::Patch::patch( $src, $p, { STYLE => "Unified" } ) };
    if ($out) {
      open(OUT, ">", $k) or die "###ERROR### Cannot open file for writing: '$k'\n";
      print(OUT $out);
      close(OUT);
    }
    else {
      warn "###WARN### Patching '$k' failed: $@";
    }
  }