diff --git a/flash-hmcfgusb.c b/flash-hmcfgusb.c
index 4751022..ae7361e 100644
--- a/flash-hmcfgusb.c
+++ b/flash-hmcfgusb.c
@@ -56,7 +56,7 @@ static int parse_hmcfgusb(uint8_t *buf, int buf_len, void *data)
 	return 1;
 }
 
-void flash_hmcfgusb_syntax(char *prog)
+void flash_hmcfgusb_syntax(const char *prog)
 {
 	fprintf(stderr, "Syntax: %s [options] filename.enc\n\n", prog);
 	fprintf(stderr, "Possible options:\n");
diff --git a/flash-hmmoduart.c b/flash-hmmoduart.c
index 8249f89..eb6263d 100644
--- a/flash-hmmoduart.c
+++ b/flash-hmmoduart.c
@@ -54,7 +54,7 @@ static int parse_hmuartlgw(enum hmuartlgw_dst __attribute__((unused)) dst, uint8
 	return 1;
 }
 
-void flash_hmmoduart_syntax(char *prog)
+void flash_hmmoduart_syntax(const char *prog)
 {
 	fprintf(stderr, "Syntax: %s [options] -U /dev/ttyAMA0 filename.eq3\n\n", prog);
 	fprintf(stderr, "Mandatory parameter:\n");
diff --git a/flash-ota.c b/flash-ota.c
index 2f28f4b..654f3ee 100644
--- a/flash-ota.c
+++ b/flash-ota.c
@@ -617,7 +617,7 @@ static int switch_speed(struct hm_dev *dev, struct recv_data *rdata, uint8_t spe
 	return 1;
 }
 
-void flash_ota_syntax(char *prog)
+void flash_ota_syntax(const char *prog)
 {
 	fprintf(stderr, "Syntax: %s parameters options\n\n", prog);
 	fprintf(stderr, "Mandatory parameters:\n");
@@ -1214,7 +1214,7 @@ int main(int argc, char **argv)
 	if (debug) {
 		printf("\n");
 	} else {
-		printf(": %04u/%04u %c", 0u, (unsigned int)fw->fw_blocks, twiddlie[0]);
+		printf(": %04d/%04d %c", 0, fw->fw_blocks, twiddlie[0]);
 		fflush(stdout);
 	}
 
@@ -1272,15 +1272,15 @@ int main(int argc, char **argv)
 					fprintf(stderr, "\nToo many errors, giving up!\n");
 					exit(EXIT_FAILURE);
 				} else {
-					printf("Flashing %d blocks: %04u/%04u %c", fw->fw_blocks, (unsigned int)(block + 1), (unsigned int)fw->fw_blocks, twiddlie[msgnum % sizeof(twiddlie)]);
+					printf("Flashing %d blocks: %04d/%04d %c", fw->fw_blocks, block + 1, fw->fw_blocks, twiddlie[msgnum % sizeof(twiddlie)]);
 				}
 			}
 
 			msgnum++;
 
 			if (!debug) {
-				printf("\b\b\b\b\b\b\b\b\b\b\b%04u/%04u %c",
-					(unsigned int)(block + 1), (unsigned int)fw->fw_blocks, twiddlie[msgnum % sizeof(twiddlie)]);
+				printf("\b\b\b\b\b\b\b\b\b\b\b%04d/%04d %c",
+					block + 1, fw->fw_blocks, twiddlie[msgnum % sizeof(twiddlie)]);
 				fflush(stdout);
 			}
 		} while((pos - &(fw->fw[block][2])) < len);
diff --git a/hexdump.h b/hexdump.h
index 127bfb0..bc0db2a 100644
--- a/hexdump.h
+++ b/hexdump.h
@@ -1,3 +1,6 @@
+#ifndef HEXDUMP_H
+#define HEXDUMP_H
+
 /* simple hexdumper
  *
  * Copyright (c) 2004-2016 Michael Gernoth <michael@gernoth.net>
@@ -56,3 +59,5 @@ static void hexdump(const unsigned char *buf, int len, const char *prefix)
 	asciishow(buf+i-(i%16), (i%16));
 	fprintf(stderr, "\n");
 }
+
+#endif /* HEXDUMP_H */
diff --git a/hmland.c b/hmland.c
index f6ef096..5dc9146 100644
--- a/hmland.c
+++ b/hmland.c
@@ -638,7 +638,7 @@ __attribute__((noreturn)) void sigterm_handler(int __attribute__((unused)) sig)
 #define FLAG_DAEMON	(1 << 0)
 #define FLAG_PID_FILE	(1 << 1)
 
-static int socket_server(char *iface, int port, int flags)
+static int socket_server(const char *iface, int port, int flags)
 {
 	struct sigaction sact;
 	struct sockaddr_in sin;
@@ -804,7 +804,7 @@ static int interactive_server(int flags)
 	return EXIT_SUCCESS;
 }
 
-void hmlan_syntax(char *prog)
+void hmlan_syntax(const char *prog)
 {
 	fprintf(stderr, "Syntax: %s options\n\n", prog);
 	fprintf(stderr, "Possible options:\n");
diff --git a/hmsniff.c b/hmsniff.c
index c1c1f7a..5b4130b 100644
--- a/hmsniff.c
+++ b/hmsniff.c
@@ -256,7 +256,7 @@ static int parse_hmuartlgw(enum hmuartlgw_dst dst, uint8_t *buf, int buf_len, vo
 	return 1;
 }
 
-void hmsniff_syntax(char *prog)
+void hmsniff_syntax(const char *prog)
 {
 	fprintf(stderr, "Syntax: %s options\n\n", prog);
 	fprintf(stderr, "Possible options:\n");
diff --git a/util.c b/util.c
index d22afe1..0b3251a 100644
--- a/util.c
+++ b/util.c
@@ -48,7 +48,7 @@ __attribute__((const)) int validate_nibble(uint8_t a)
 	return 0;
 }
 
-__attribute__((const)) char nibble_to_ascii(uint8_t n)
+__attribute__((pure)) char nibble_to_ascii(uint8_t n)
 {
 	const uint8_t nibble[16] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
 		'A', 'B', 'C', 'D', 'E', 'F'};
diff --git a/util.h b/util.h
index b78c7d5..fa27779 100644
--- a/util.h
+++ b/util.h
@@ -26,6 +26,6 @@
 
 __attribute__((const)) uint8_t ascii_to_nibble(uint8_t a);
 __attribute__((const)) int validate_nibble(uint8_t a);
-__attribute__((const)) char nibble_to_ascii(uint8_t n);
+__attribute__((pure)) char nibble_to_ascii(uint8_t n);
 
 #endif /* UTIL_H */
diff --git a/version.h b/version.h
index cd8d17a..7c1f80a 100644
--- a/version.h
+++ b/version.h
@@ -1 +1,6 @@
-#define VERSION	"0.103-git"
+#ifndef VERSION_H
+#define VERSION_H
+
+#define VERSION	"1.0.1"
+
+#endif /* VERSION_H */