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  my $self = shift;
  require ExtUtils::Command;
  local @ARGV = ('build_done');
  ExtUtils::Command::touch();
  $self->add_to_cleanup('build_done');
}

sub clean_build_done_marker {
  my $self = shift;
  unlink 'build_done' if (-e 'build_done');
}

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($fh);
  return ($sha1->hexdigest eq $sha1sum) ? 1 : 0
}

sub find_file {
  my ($self, $dir, $re) = @_;
  my @files;
  $re ||= qr/.*/;
  find({ wanted => sub { push @files, rel2abs($_) if /$re/ }, follow => 1, no_chdir => 1 , follow_skip => 2}, $dir);
  return @files;
}

sub quote_literal {
    my ($self, $txt) = @_;
    if ($^O eq 'MSWin32') {
      $txt =~ s|"|\\"|g;
      return qq("$txt");
    }
    return $txt;
}

# 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: $@";
    }
  }
}

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

  return $Config{make} if $^O =~ /^(cygwin|MSWin32)$/;

  my @try = ($Config{gmake}, 'gmake', 'make', $Config{make});
  my %tested;
  print "Gonna detect GNU make:\n";
  foreach my $name ( @try ) {
    next unless $name;
    next if $tested{$name};
    $tested{$name} = 1;
    print "- testing: '$name'\n";
    if ($self->_is_gnu_make($name)) {
      print "- found: '$name'\n";
      return $name
    }
  }
  print "- fallback to: 'make'\n";
  return 'make';
}

sub _is_gnu_make {
  my ($self, $name) = @_;
  my $devnull = File::Spec->devnull();
  my $ver = `$name --version 2> $devnull`;
  if ($ver =~ /GNU Make/i) {
    return 1;
  }
  return 0;
}

sub search_env_path {
  my $self = shift;
  my $sep = $Config{path_sep};
  my $ext = $Config{exe_ext};
  for my $exe (@_) {
    for my $dir (split /\Q$sep\E/,$ENV{PATH}) {
      return $exe if -x "$dir/$exe$ext";
    }
  }
}