use Devel::CheckOS qw(os_is);

if(os_is('MSWin32')) {
  eval 'use MyApplication::Platform::Win32';
} elsif(os_is('MacOSX')) {
  eval 'use MyApplication::Platform::MacOSX';
} else {
  warn "not MSWin32 or MacOSX, falling back to defaults\n";
  eval 'use MyApplication::Platform::Default';
}