import java.nio.file.Paths;
import java.nio.file.Files;
import java.nio.file.attribute.PosixFilePermission;

// requires Java 7
// assumes the file is yours
static void makeExecutable_java7(File file) ctex {
  if (isWindows()) ret;
  Set<PosixFilePermission> p = new HashSet<PosixFilePermission>(Files.getPosixFilePermissions(file.toPath()));
  p.add(PosixFilePermission.OWNER_READ);
  p.add(PosixFilePermission.OWNER_EXECUTE);
  p.add(PosixFilePermission.GROUP_READ);
  p.add(PosixFilePermission.GROUP_EXECUTE);
  p.add(PosixFilePermission.OTHERS_READ);
  p.add(PosixFilePermission.OTHERS_EXECUTE);
  Files.setPosixFilePermissions(file.toPath(), p);
}