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    $self->add_to_cleanup($build_src, $build_out);

    # save some data into future Alien::Box2D::ConfigData
    $self->config_data('build_prefix', $build_out);
    $self->config_data('build_params', $bp);
    $self->config_data('config', {}); # just to be sure

    $self->fetch_sources($download);
    $self->extract_sources($download, $build_src);
    $self->clean_dir($build_out);
    $self->build_binaries($build_out, $build_src);
    $self->set_config_data($build_out);

    # mark sucessfully finished build
    $self->touch_build_done_marker;
  }

  $self->SUPER::ACTION_code;
}

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

sub extract_sources {
  my ($self, $download, $build_src) = @_;
  my $bp = $self->notes('build_params');

  my $srcdir = catfile($build_src, $bp->{dirname});
  my $unpack = 'y';
  $unpack = $self->prompt("Dir '$srcdir' exists, wanna replace with clean sources?", "n") if (-d $srcdir);
  if (lc($unpack) eq 'y') {
    $self->clean_dir($srcdir);
    my $archive = catfile($download, File::Fetch->new(uri => $bp->{url})->file);
    print "Extracting sources...\n";
    my $ae = Archive::Extract->new( archive => $archive );
    die "###ERROR###: cannot extract $bp ", $ae->error unless $ae->extract(to => $build_src);
    $self->apply_patch($build_src, $_) foreach (@{$bp->{patches}});
  }
  return 1;
}

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

  # try to find Box2D root dir
  my $prefix = rel2abs($build_out);
  $self->config_data('share_subdir', $self->{properties}->{dist_version});

  # set defaults
  my $cfg = {
    # defaults (used on MS Windows build)
    version     => $self->notes('build_box2d_version'),
    prefix      => '@PrEfIx@',
    libs        => '-L' . $self->quote_literal('@PrEfIx@/lib') . ' -lBox2D',
    cflags      => '-I' . $self->quote_literal('@PrEfIx@/include'),
    shared_libs => [ ],
  };

  if($^O =~ /(bsd|linux)/) {
    $cfg->{libs} = '-L' . $self->quote_literal('@PrEfIx@/lib') . ' -Wl,-rpath,' . $self->quote_literal('@PrEfIx@/lib') . ' -lBox2D -lm',
  }

  # write config
  $self->config_data('config', $cfg);
}

sub build_binaries {
  my( $self, $build_out, $build_src ) = @_;
  my $bp = $self->notes('build_params');

  print "BUILDING '" . $bp->{dirname} . "'...\n";
  my $srcdir = catfile($build_src, $bp->{dirname});
  my $prefixdir = rel2abs($build_out);
  $self->config_data('build_prefix', $prefixdir); # save it for future Alien::Box2D::ConfigData

  # some platform specific stuff
  my $makefile = rel2abs('patches/Makefile.unix');
  $makefile = rel2abs('patches/Makefile.mingw') if $^O eq 'MSWin32' && $Config{cc} =~ /gcc/;
  $makefile = rel2abs('patches/Makefile.nmake') if $^O eq 'MSWin32' && $Config{cc} =~ /cl/;
  my $cxxflags = '-O3';
  $cxxflags   .= " $1" if $Config{cccdlflags} =~ /((-[df]PIC\s+)?-[df]PIC)/i;
  # MacOSX related flags
  # 'as' for 'arch' can be in /usr/libexec/gcc/darwin/<arch_type>/as or in /usr/local/libexec/gcc/darwin/<arch_type>/as
  foreach my $arch (qw(x86_64 i386 ppc)) {
    if($Config{ccflags} =~ /-arch \Q$arch\E/
    && (-e "/usr/libexec/gcc/darwin/$arch/as"
     || -e "/usr/local/libexec/gcc/darwin/$arch/as")) {
      $cxxflags .= " -arch $arch";
    }
  }

  my $cxx = $self->search_env_path(qw/c++ g++ gpp aCC CC cxx cc++ cl FCC KCC RCC xlC_r xlC/); #search PATH for c++ compiler
  my $ar = $self->search_env_path('ar');
  my $ranlib = $self->search_env_path('ranlib');
  ### workaround for http://www.cpantesters.org/cpan/report/16e1fb62-8bc3-11e0-a7f7-6524785ebe45
  #On solaris, some tools like 'ar' are not in the default PATH, but in /usr/???/bin