diff --git a/src/utils/common.h b/src/utils/common.h
index 1741145..833469a 100644
--- a/src/utils/common.h
+++ b/src/utils/common.h
@@ -344,6 +344,9 @@
 #ifndef ETH_P_OUI
 #define ETH_P_OUI 0x88B7
 #endif /* ETH_P_OUI */
+#ifndef ETH_P_8021Q
+#define ETH_P_8021Q 0x8100
+#endif /* ETH_P_8021Q */
 
 
 #ifdef __GNUC__
diff --git a/src/utils/json.c b/src/utils/json.c
index b644339..3e5e214 100644
--- a/src/utils/json.c
+++ b/src/utils/json.c
@@ -51,7 +51,7 @@
 				*txt++ = data[i];
 			} else {
 				txt += os_snprintf(txt, end - txt, "\\u%04x",
-						   data[i]);
+						   (unsigned char) data[i]);
 			}
 			break;
 		}
diff --git a/src/utils/os_internal.c b/src/utils/os_internal.c
index 474c8a3..feade6e 100644
--- a/src/utils/os_internal.c
+++ b/src/utils/os_internal.c
@@ -25,10 +25,16 @@
 
 void os_sleep(os_time_t sec, os_time_t usec)
 {
+#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L)
+	const struct timespec req = { sec, usec * 1000 };
+
+	nanosleep(&req, NULL);
+#else
 	if (sec)
 		sleep(sec);
 	if (usec)
 		usleep(usec);
+#endif
 }
 
 
diff --git a/src/utils/os_unix.c b/src/utils/os_unix.c
index b56bab2..494bf4c 100644
--- a/src/utils/os_unix.c
+++ b/src/utils/os_unix.c
@@ -51,10 +51,16 @@
 
 void os_sleep(os_time_t sec, os_time_t usec)
 {
+#if defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200809L)
+	const struct timespec req = { sec, usec * 1000 };
+
+	nanosleep(&req, NULL);
+#else
 	if (sec)
 		sleep(sec);
 	if (usec)
 		usleep(usec);
+#endif
 }
 
 
diff --git a/src/utils/trace.c b/src/utils/trace.c
index e0b5b0b..4084343 100644
--- a/src/utils/trace.c
+++ b/src/utils/trace.c
@@ -186,7 +186,7 @@
 	if (abfd == NULL)
 		return;
 
-	data.pc = (bfd_hostptr_t) (pc - start_offset);
+	data.pc = (bfd_hostptr_t) ((u8 *) pc - start_offset);
 	data.found = FALSE;
 	bfd_map_over_sections(abfd, find_addr_sect, &data);
 
@@ -227,7 +227,7 @@
 	if (abfd == NULL)
 		return NULL;
 
-	data.pc = (bfd_hostptr_t) (pc - start_offset);
+	data.pc = (bfd_hostptr_t) ((u8 *) pc - start_offset);
 	data.found = FALSE;
 	bfd_map_over_sections(abfd, find_addr_sect, &data);
 
@@ -299,7 +299,7 @@
 	for (i = 0; i < btrace_num; i++) {
 		struct bfd_data data;
 
-		data.pc = (bfd_hostptr_t) (btrace_res[i] - start_offset);
+		data.pc = (bfd_hostptr_t) ((u8 *) btrace_res[i] - start_offset);
 		data.found = FALSE;
 		bfd_map_over_sections(abfd, find_addr_sect, &data);
 
diff --git a/src/utils/wpa_debug.h b/src/utils/wpa_debug.h
index 1fe0b7d..c94c439 100644
--- a/src/utils/wpa_debug.h
+++ b/src/utils/wpa_debug.h
@@ -305,7 +305,6 @@
 #define HOSTAPD_MODULE_RADIUS		0x00000004
 #define HOSTAPD_MODULE_WPA		0x00000008
 #define HOSTAPD_MODULE_DRIVER		0x00000010
-#define HOSTAPD_MODULE_IAPP		0x00000020
 #define HOSTAPD_MODULE_MLME		0x00000040
 
 enum hostapd_logger_level {