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  my ($self, $url, $sha1sum, $download) = @_;
  die "###ERROR### _fetch_file undefined url\n" unless $url;
  die "###ERROR### _fetch_file undefined sha1sum\n" unless $sha1sum;
  my $ff = File::Fetch->new(uri => $url);
  my $fn = catfile($download, $ff->file);
  if (-e $fn) {
    print "Checking checksum for already existing '$fn'...\n";
    return 1 if $self->check_sha1sum($fn, $sha1sum);
    unlink $fn; #exists but wrong checksum
  }
  print "Fetching '$url'...\n";
  my $fullpath = $ff->fetch(to => $download);
  die "###ERROR### Unable to fetch '$url'" unless $fullpath;
  if (-e $fn) {
    print "Checking checksum for '$fn'...\n";
    return 1 if $self->check_sha1sum($fn, $sha1sum);
    die "###ERROR### Checksum failed '$fn'";
  }
  die "###ERROR### _fetch_file failed '$fn'";
}

sub fetch_binaries {
  my ($self, $download) = @_;
  my $bp = $self->notes('build_params');
  $self->fetch_file($bp->{url}, $bp->{sha1sum}, $download);
}

sub check_prereqs {
  my ($self) = @_;
  my $bp = $self->notes('build_params');
  #print "-l$_\n" foreach (@{$_->{libs}) foreach (@{$bp->{prereqs}});
}

sub fetch_sources {
  my ($self, $download) = @_;
  my $bp = $self->notes('build_params');
  $self->fetch_file($_->{url}, $_->{sha1sum}, $download) foreach (@{$bp->{members}});
}

sub extract_binaries {
  my ($self, $download, $build_out) = @_;

  # do extract binaries
  my $bp = $self->notes('build_params');
  my $archive = catfile($download, File::Fetch->new(uri => $bp->{url})->file);
  print "Extracting $archive...\n";
  my $ae = Archive::Extract->new( archive => $archive );
  die "###ERROR###: Cannot extract $archive ", $ae->error unless $ae->extract(to => $build_out);

  # fix hardcoded prefix path in bin/libpng-config
  my ($version, $prefix, $incdir, $libdir) = find_PNG_dir(rel2abs($build_out));
  sed_inplace("$prefix/bin/libpng-config", 's/^prefix=.*/prefix=\''.quotemeta($prefix).'\'/');
}

sub extract_sources {
  my ($self, $download, $patches, $build_src) = @_;
  my $bp = $self->notes('build_params');
  foreach my $pack (@{$bp->{members}}) {
    my $srcdir = catfile($build_src, $pack->{dirname});
    my $unpack = 'y';
    $unpack = $self->prompt("Dir '$srcdir' exists, wanna replace with clean sources?", "n") if (-d $srcdir);
    if (lc($unpack) eq 'y') {
      my $archive = catfile($download, File::Fetch->new(uri => $pack->{url})->file);
      print "Extracting $pack->{pack}...\n";
      my $ae = Archive::Extract->new( archive => $archive );
      die "###ERROR###: cannot extract $pack ", $ae->error unless $ae->extract(to => $build_src);
      foreach my $i (@{$pack->{patches}}) {
        chdir $srcdir;
        print "Checking affected files for patch '$i'\n";
        foreach my $k ($self->patch_get_affected_files($srcdir, catfile($patches, $i))) {
		  # doing the same like -p1 for 'patch'
		  $k =~ s/^[^\/]*\/(.*)$/$1/;
          if(-e $k) {
			print "Preparing file '$k'\n";
            sed_inplace( $k, 's/\r\n/\n/gm' ); # converting to UNIX newlines
          }
		  else {
		    print "###WARN### file '$k' for patch '$i' not found\n";
		  }
        }
        print "Applying patch '$i'\n";
        my $cmd = $self->patch_command($srcdir, catfile($patches, $i));
        if ($cmd) {
          print "(cmd: $cmd)\n";
          $self->do_system($cmd) or die "###ERROR### [$?] during patch ... ";
        }
        chdir $self->base_dir();
      }
    }
  }
  return 1;
}

sub set_config_data {
  my( $self, $build_out ) = @_;

  # try to find PNG root dir
  my ($version, $prefix, $incdir, $libdir) = find_PNG_dir(rel2abs($build_out));
  die "###ERROR### Cannot find PNG directory in 'sharedir'" unless $version;
  $self->config_data('share_subdir', abs2rel($prefix, rel2abs('sharedir')));

  # set defaults
  my $cfg = {
    # defaults
    version     => $version,
    prefix      => '@PrEfIx@',
    libs        => '-L' . $self->get_path('@PrEfIx@/lib') . ' -lpng',
    cflags      => '-I' . $self->get_path('@PrEfIx@/include') . ' -D_GNU_SOURCE=1', # -Dmain=SDL_main
    shared_libs => [ ],
  };

  # overwrite values available via libpng-config
  my $bp = $self->config_data('build_prefix') || $prefix;
  my $devnull = File::Spec->devnull();
  my $script = rel2abs("$prefix/bin/libpng-config");
  foreach my $p (qw(version prefix L_opts libs I_opts cflags)) {
    my $o=`$script --$p 2>$devnull`;
    if ($o) {
      $o =~ s/[\r\n]*$//;
      $o =~ s/\Q$prefix\E/\@PrEfIx\@/g;
      $cfg->{$p} = $o;