diff --git a/cgps.c b/cgps.c
index 56f90736..db67a487 100644
--- a/cgps.c
+++ b/cgps.c
@@ -809,7 +809,7 @@ int main(int argc, char *argv[])
 	    wait_clicks = 0;
 	    errno = 0;
 	    if (gps_read(&gpsdata) == -1) {
-		fprintf(stderr, "cgps: socket error 4\n");
+		(void)fprintf(stderr, "cgps: socket error 4\n");
 		die(errno == 0 ? GPS_GONE : GPS_ERROR);
 	    } else {
 		/* Here's where updates go now that things are established. */
diff --git a/driver_nmea2000.c b/driver_nmea2000.c
index 47b051b2..ee85ce17 100644
--- a/driver_nmea2000.c
+++ b/driver_nmea2000.c
@@ -1370,18 +1370,18 @@ static void find_pgn(struct can_frame *frame, struct gps_device_t *session)
 	    struct timespec  msgTime;
 
 	    clock_gettime(CLOCK_REALTIME, &msgTime);
-	    fprintf(logFile,
-		    "(%010d.%06d) can0 %08x#",
-		    (unsigned int)msgTime.tv_sec,
-		    (unsigned int)msgTime.tv_nsec/1000,
-		    frame->can_id & 0x1ffffff);
+	    (void)fprintf(logFile,
+	                  "(%010d.%06d) can0 %08x#",
+	                  (unsigned int)msgTime.tv_sec,
+	                  (unsigned int)msgTime.tv_nsec/1000,
+	                  frame->can_id & 0x1ffffff);
 	    if ((frame->can_dlc & 0x0f) > 0) {
 		int l1;
 	        for(l1=0;l1<(frame->can_dlc & 0x0f);l1++) {
-		    fprintf(logFile, "%02x", frame->data[l1]);
+		    (void)fprintf(logFile, "%02x", frame->data[l1]);
 		}
 	    }
-	    fprintf(logFile, "\n");
+	    (void)fprintf(logFile, "\n");
 	}
 #endif /* of if LOG_FILE */
 	session->driver.nmea2000.can_msgcnt += 1;
diff --git a/gps2udp.c b/gps2udp.c
index c02d8929..eb01eb90 100644
--- a/gps2udp.c
+++ b/gps2udp.c
@@ -89,7 +89,7 @@ static int send_udp (char *nmeastring, size_t ind)
 	/* compute message size and add 0x0a 0x0d */
 	for (ind=0; nmeastring [ind] != '\0'; ind ++) {
 	    if (ind >= sizeof(message) - 3) {
-		fprintf(stderr, "gps2udp: too big [%s] \n", nmeastring);
+		(void)fprintf(stderr, "gps2udp: too big [%s] \n", nmeastring);
 		return -1;
 	    }
 	    message[ind] = nmeastring[ind];
@@ -157,14 +157,14 @@ static int open_udp(char **hostport)
 
        sock[channel]= socket(AF_INET, SOCK_DGRAM, 0);
        if (sock[channel] < 0) {
-	   fprintf(stderr, "gps2udp: error creating UDP socket\n");
+	   (void)fprintf(stderr, "gps2udp: error creating UDP socket\n");
 	   return (-1);
        }
 
        remote[channel].sin_family = (sa_family_t)AF_INET;
        hp = gethostbyname(hostname);
        if (hp==NULL) {
-	   fprintf(stderr, "gps2udp: syntax is [-u hostname:port] [%s] is not a valid hostname\n",hostname);
+	   (void)fprintf(stderr, "gps2udp: syntax is [-u hostname:port] [%s] is not a valid hostname\n",hostname);
 	   return (-1);
        }
 
@@ -476,7 +476,7 @@ int main(int argc, char **argv)
 		    (void)fprintf(stdout," MMSI=%9u", mmsi);
 
 		}
-		fprintf(stdout,"\n");
+		(void)fprintf(stdout,"\n");
 	    }
 
 	    // send to all UDP destinations
@@ -496,7 +496,7 @@ int main(int argc, char **argv)
     } // end for (;;)
 
     // This is an infinite loop, should never be here
-    fprintf (stderr, "gpsd2udp ERROR abnormal exit\n");
+    (void)fprintf (stderr, "gpsd2udp ERROR abnormal exit\n");
     exit (-1);
 }
 
diff --git a/gpsctl.c b/gpsctl.c
index d0b75401..69d5e932 100644
--- a/gpsctl.c
+++ b/gpsctl.c
@@ -328,7 +328,7 @@ int main(int argc, char **argv)
 	    exit(EXIT_SUCCESS);
 	case 'h':
 	default:
-	    fprintf(stderr, USAGE);
+	    (void)fprintf(stderr, USAGE);
 	    break;
 	}
     }
diff --git a/gpspipe.c b/gpspipe.c
index 680f0625..4a74b0a9 100644
--- a/gpspipe.c
+++ b/gpspipe.c
@@ -70,13 +70,13 @@ static void open_serial(char *device)
      * tty.
      */
     if ((fd_out = open(device, O_RDWR | O_NOCTTY)) == -1) {
-	fprintf(stderr, "gpspipe: error opening serial port\n");
+	(void)fprintf(stderr, "gpspipe: error opening serial port\n");
 	exit(EXIT_FAILURE);
     }
 
     /* Save current serial port settings for later */
     if (tcgetattr(fd_out, &oldtio) != 0) {
-	fprintf(stderr, "gpspipe: error reading serial port settings\n");
+	(void)fprintf(stderr, "gpspipe: error reading serial port settings\n");
 	exit(EXIT_FAILURE);
     }
 
@@ -362,17 +362,17 @@ int main(int argc, char **argv)
 		    }
 		}
 		if (fputc(c, fp) == EOF) {
-		    fprintf(stderr, "gpspipe: write error, %s(%d)\n",
-			    strerror(errno), errno);
+		    (void)fprintf(stderr, "gpspipe: write error, %s(%d)\n",
+		                  strerror(errno), errno);
 		    exit(EXIT_FAILURE);
 		}
 
 		if (c == '\n') {
 		    if (serialport != NULL) {
 			if (write(fd_out, serbuf, (size_t) j) == -1) {
-			    fprintf(stderr,
-				    "gpspipe: serial port write error, %s(%d)\n",
-				    strerror(errno), errno);
+			    (void)fprintf(stderr,
+			                  "gpspipe: serial port write error, %s(%d)\n",
+			                  strerror(errno), errno);
 			    exit(EXIT_FAILURE);
 			}
 			j = 0;
diff --git a/gpxlogger.c b/gpxlogger.c
index b647b35a..a94c65d5 100644
--- a/gpxlogger.c
+++ b/gpxlogger.c
@@ -182,11 +182,11 @@ static void quit_handler(int signum)
 
 static void usage(void)
 {
-    fprintf(stderr,
-	    "Usage: %s [-V] [-h] [-d] [-i timeout] [-f filename] [-m minmove]\n"
-	    "\t[-r] [-e exportmethod] [server[:port:[device]]]\n\n"
-	    "defaults to '%s -i 5 -e %s localhost:2947'\n",
-	    progname, progname, export_default()->name);
+    (void)fprintf(stderr,
+                  "Usage: %s [-V] [-h] [-d] [-i timeout] [-f filename] [-m minmove]\n"
+                  "\t[-r] [-e exportmethod] [server[:port:[device]]]\n\n"
+                  "defaults to '%s -i 5 -e %s localhost:2947'\n",
+                  progname, progname, export_default()->name);
     exit(EXIT_FAILURE);
 }
 
@@ -263,8 +263,8 @@ int main(int argc, char **argv)
 	    if (timeout < 1)
 		timeout = 1;
 	    if (timeout >= 3600)
-		fprintf(stderr,
-			"WARNING: track timeout is an hour or more!\n");
+		(void)fprintf(stderr,
+		              "WARNING: track timeout is an hour or more!\n");
 	    break;
 	case 'l':
 	    export_list(stderr);
diff --git a/lcdgps.c b/lcdgps.c
index eb95f498..26ff8c90 100644
--- a/lcdgps.c
+++ b/lcdgps.c
@@ -405,7 +405,7 @@ int main(int argc, char *argv[])
 
     for (;;) { /* heart of the client */
 	if (!gps_waiting(&gpsdata, 50000000)) {
-	    fprintf( stderr, "lcdgps: error while waiting\n");
+	    (void)fprintf( stderr, "lcdgps: error while waiting\n");
 	    exit(EXIT_FAILURE);
 	} else {
 	    (void)gps_read(&gpsdata);
diff --git a/libgps_core.c b/libgps_core.c
index 644b96d4..54eb8c78 100644
--- a/libgps_core.c
+++ b/libgps_core.c
@@ -102,7 +102,7 @@ int gps_open(const char *host,
 #endif /* SOCKET_EXPORT_ENABLE */
 
 #ifndef USES_HOST
-    fprintf(stderr, "No methods available for connnecting to %s!\n", host);
+    (void)fprintf(stderr, "No methods available for connnecting to %s!\n", host);
 #endif /* USES_HOST */
 #undef USES_HOST
 
diff --git a/ntpshmmon.c b/ntpshmmon.c
index f8768a35..04cd8c6e 100644
--- a/ntpshmmon.c
+++ b/ntpshmmon.c
@@ -57,7 +57,7 @@ int main(int argc, char **argv)
 			  argv[0], VERSION, REVISION);
 	    exit(EXIT_SUCCESS);
 	case 'h':
-	    fprintf(stderr,
+	  (void)fprintf(stderr,
                 "usage: ntpshmmon [-s] [-n max] [-t timeout] [-v] [-h] [-V]\n"
                 "  -h           print this help\n"
                 "  -n nsamples  exit after nsamples\n"
@@ -77,7 +77,7 @@ int main(int argc, char **argv)
     for (i = 0; i < NTPSEGMENTS; i++) {
 	segments[i] = shm_get(i, false, true);
 	if (verbose && segments[i] != NULL)
-	    fprintf(stderr, "unit %d opened\n", i);
+	  (void)fprintf(stderr, "unit %d opened\n", i);
     }
 
     if (killall) {
@@ -108,7 +108,7 @@ int main(int argc, char **argv)
 	    long long diff;  /* 32 bit long is too short for a timespec */
 	    enum segstat_t status = ntp_read(segments[i], &shm_stat, false);
 	    if (verbose)
-		fprintf(stderr, "unit %d status %d\n", i, status);
+		(void)fprintf(stderr, "unit %d status %d\n", i, status);
 	    switch(status) {
 	    case OK:
 		/* ntpd can slew the clock at 120% real time
@@ -144,15 +144,15 @@ int main(int argc, char **argv)
 		/* do nothing, data not ready, wait another cycle */
 		break;
 	    case BAD_MODE:
-		fprintf(stderr, "ntpshmmon: unknown mode %d on segment %s\n",
-			shm_stat.status, ntp_name(i));
+		(void)fprintf(stderr, "ntpshmmon: unknown mode %d on segment %s\n",
+		              shm_stat.status, ntp_name(i));
 		break;
 	    case CLASH:
 		/* do nothing, data is corrupt, wait another cycle */
 		break;
 	    default:
-		fprintf(stderr, "ntpshmmon: unknown status %d on segment %s\n",
-			status, ntp_name(i));
+		(void)fprintf(stderr, "ntpshmmon: unknown status %d on segment %s\n",
+		              status, ntp_name(i));
 		break;
 	    }
 	}
diff --git a/ppscheck.c b/ppscheck.c
index 21ccac08..1a6a9acc 100644
--- a/ppscheck.c
+++ b/ppscheck.c
@@ -64,9 +64,9 @@ static const struct assoc hlines[] = {
 
 static void usage(void)
 {
-	fprintf(stderr, "usage: ppscheck [-h] [ -V] <device>\n");
-	fprintf(stderr, "                 -h   print usage\n");
-	fprintf(stderr, "                 -V   print cwVersion\n");
+	(void)fprintf(stderr, "usage: ppscheck [-h] [ -V] <device>\n");
+	(void)fprintf(stderr, "                 -h   print usage\n");
+	(void)fprintf(stderr, "                 -V   print cwVersion\n");
 	exit(1);
 }
 
diff --git a/test_geoid.c b/test_geoid.c
index 8f0480af..eeed567d 100644
--- a/test_geoid.c
+++ b/test_geoid.c
@@ -15,7 +15,7 @@ int main(int argc, char **argv)
     double lat, lon;
 
     if (argc != 3) {
-	fprintf(stderr, "Usage: %s lat lon\n", argv[0]);
+	(void)fprintf(stderr, "Usage: %s lat lon\n", argv[0]);
 	return 1;
     }
 
@@ -23,17 +23,17 @@ int main(int argc, char **argv)
     lon = atof(argv[2]);
 
     if (lon > 180.0 || lat < -180.0) {
-	fprintf(stderr, " -180 <= lon=%s(%.f) <= 180 ?\n", argv[2], lon);
+	(void)fprintf(stderr, " -180 <= lon=%s(%.f) <= 180 ?\n", argv[2], lon);
 	return 1;
     }
 
     if (lat > 90.0 || lat < -90.0) {
-	fprintf(stderr, " -90 <= lat=%s(%.f) <= 90 ?\n", argv[1], lat);
+	(void)fprintf(stderr, " -90 <= lat=%s(%.f) <= 90 ?\n", argv[1], lat);
 	return 1;
     }
 
-    printf(" lat= %f lon= %f geoid correction= %f\n",
-	   lat, lon, wgs84_separation(lat, lon));
+    (void)printf(" lat= %f lon= %f geoid correction= %f\n",
+                 lat, lon, wgs84_separation(lat, lon));
 
     return 0;
 }