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      }
      else {
        $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';
      $extract_src = $self->prompt("Overwrite existing sources? (y/n)", "n") if (-d $self->notes('tidyp_src'));
      if (lc($extract_src) eq 'y') {
        my $ae = Archive::Extract->new( archive => $archive );
        $self->notes('tidyp_src');
        $ae->extract(to => $build_src) || die "###ERROR### Cannot extract tarball ", $ae->error;
        die "###ERROR### Cannot find expected dir='",$self->notes('tidyp_src'),"'" unless -d $self->notes('tidyp_src');
      }
      
      # go for build
      $self->build_binaries($build_out, $self->notes('tidyp_src'));
      # store info about build into future Alien::Tidyp::ConfigData
      $self->config_data('share_subdir', $self->{properties}->{dist_version});
      $self->config_data('config', { PREFIX => '@PrEfIx@',
                                     LIBS   => '-L' . $self->quote_literal('@PrEfIx@/lib') . ' -ltidyp',
                                     INC    => '-I' . $self->quote_literal('@PrEfIx@/include/tidyp'),
                                   });
    }
    # 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 build_binaries {
  die "###ERROR### My::Builder cannot build libtidyp from sources, use rather My::Builder::<platform>";
}

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

sub check_installed_tidyp {
  my ($self) = @_;

  require ExtUtils::CBuilder;
  my $cb = ExtUtils::CBuilder->new( quiet => 1 );
  my $dir = tempdir( CLEANUP => 1 );
  my ($fs, $src) = tempfile( DIR => $dir, SUFFIX => '.c' );
  syswrite($fs, <<MARKER); # write test source code
#include <tidyp.h>
int main() { tidyVersion(); return 0; }

MARKER
  close($fs);

  my $tdir = $ENV{TIDYP_DIR} || '';
  my @candidates;
  push(@candidates, { L => "$tdir/lib", I => "$tdir/include/tidyp" }) if -d $tdir;
  push(@candidates, { L => '/usr/local/lib', I => '/usr/local/include/tidyp' });
  push(@candidates, { L => '/usr/lib', I => '/usr/include/tidyp' });
  push(@candidates, { L => '', I => "$Config{usrinc}/tidyp" });

  print STDERR "Gonna detect tidyp already installed on your system:\n";
  foreach my $i (@candidates) {
    my $lflags = $i->{L} ? '-L'.$self->quote_literal($i->{L}).' -ltidyp' : '-ltidyp';
    my $cflags = $i->{I} ? '-I'.$self->quote_literal($i->{I}) : '';
    print STDERR "- testing: $cflags $lflags ...\n";
    $lflags = ExtUtils::Liblist->ext($lflags) if($Config{make} =~ /nmake/ && $Config{cc} =~ /cl/); # MSVC compiler hack
    my ($obj, $exe);
    open(my $olderr, '>&', STDERR);
    open(STDERR, '>', File::Spec->devnull());
    $obj = eval { $cb->compile( source => $src, extra_compiler_flags => $cflags ) };
    $exe = eval { $cb->link_executable( objects => $obj, extra_linker_flags => $lflags ) } if $obj;
    open(STDERR, '>&', $olderr);
    next unless $exe;
    print STDERR "- TIDYP FOUND!\n";
    $self->notes('installed_tidyp', { lflags => $lflags, cflags => $cflags } );
    return 1;
  }
  print STDERR "- tidyp not found (we have to build it from sources)!\n";
  return 0;
}