alsamixer: suppress _XOPEN_SOURCE compile warning

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --git a/alsamixer/utils.c b/alsamixer/utils.c
index 3602bef0ef0b9d6bd73ded9cb61e7584ed22d02a..7c69b9c28fde4f20d7ea6794fd78260604f19e76 100644 (file)
--- a/alsamixer/utils.c
+++ b/alsamixer/utils.c
@@ -16,7 +16,9 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef _XOPEN_SOURCE
 #define _XOPEN_SOURCE
+#endif
 #include "aconfig.h"
 #include <limits.h>
 #include <stdlib.h>