*/
/* Or gethostname won't be declared properly on Linux and GNU platforms. */
-#define _BSD_SOURCE 1
-#define _DEFAULT_SOURCE 1
+#ifndef _BSD_SOURCE
+# define _BSD_SOURCE 1
+#endif
+#ifndef _DEFAULT_SOURCE
+# define _DEFAULT_SOURCE 1
+#endif
#include <assert.h>
#include <errno.h>