--- /dev/null
+--- a/driver_ais.c
++++ b/driver_ais.c
+@@ -24,6 +24,7 @@
+
+ /* strlcpy() needs _DARWIN_C_SOURCE */
+ #define _DARWIN_C_SOURCE
++#define _BSD_SOURCE
+
+ #include <stdlib.h>
+ #include <string.h>
+--- a/gpsctl.c
++++ b/gpsctl.c
+@@ -15,6 +15,7 @@
+
+ /* strlcpy() needs _DARWIN_C_SOURCE */
+ #define _DARWIN_C_SOURCE
++#define _BSD_SOURCE
+
+ #include <stdio.h>
+ #include <stdlib.h>
+--- a/gpsd_json.c
++++ b/gpsd_json.c
+@@ -24,6 +24,7 @@ PERMISSIONS
+ #define __DARWIN_C_LEVEL 200112L
+ /* strlcpy() needs _DARWIN_C_SOURCE */
+ #define _DARWIN_C_SOURCE
++#define _BSD_SOURCE
+
+ #include <stdio.h>
+ #include <math.h>
+--- a/libgpsd_core.c
++++ b/libgpsd_core.c
+@@ -20,6 +20,7 @@
+
+ /* strlcpy() needs _DARWIN_C_SOURCE */
+ #define _DARWIN_C_SOURCE
++#define _BSD_SOURCE
+
+ #include <time.h>
+ #include <stdio.h>