try to fix build on clang linux

Author: laffer1

jj.c

@@ -21,10 +21,12 @@ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGE.
-
-$Id: jj.c,v 1.11 2009/06/04 05:16:43 laffer1 Exp $
 */
 
+/* For Linux */
+#define _BSD_SOURCE
+#define  _XOPEN_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>