diff -urN a/ganglia-3.1.1/libmetrics/linux/metrics.c b/ganglia-3.1.1/libmetrics/linux/metrics.c
--- a/ganglia-3.1.1/libmetrics/linux/metrics.c	2008-08-25 13:44:57.000000000 -0400
+++ b/ganglia-3.1.1/libmetrics/linux/metrics.c	2008-11-18 21:33:01.370635031 -0500
@@ -3,6 +3,9 @@
 #ifndef __USE_GNU
 #define __USE_GNU
 #endif
+#ifndef __USE_ISOC99
+#define __USE_ISOC99
+#endif
 #include <string.h>
 #include <time.h>
 #include <unistd.h>