--- ./gen_uuid_c	2023-04-06 18:59:49.376261216 -0600
+++ ./gen_uuid.c	2023-04-06 17:57:00.987526837 -0600
@@ -216,7 +216,7 @@
 	for (i = 0; i < n; i+= ifreq_size(*ifrp) ) {
 		ifrp = (struct ifreq *)((char *) ifc.ifc_buf+i);
 		strncpy(ifr.ifr_name, ifrp->ifr_name, IFNAMSIZ);
-#ifdef SIOCGIFHWADDR
+#if defined(SIOCGIFHWADDR) && !defined(__sun)
 		if (ioctl(sd, SIOCGIFHWADDR, &ifr) < 0)
 			continue;
 		a = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
@@ -271,11 +271,16 @@
 	THREAD_LOCAL int		state_fd = -2;
 	THREAD_LOCAL FILE		*state_f;
 	THREAD_LOCAL uint16_t		clock_seq;
+	struct flock			lock;
 	struct timeval			tv;
 	uint64_t			clock_reg;
 	mode_t				save_umask;
 	int				len;
 	int				ret = 0;
+	
+lock.l_whence = SEEK_SET;
+lock.l_start = 0;
+lock.l_len = 0;
 
 	if (state_fd == -2) {
 		save_umask = umask(0);
@@ -294,7 +299,8 @@
 	}
 	if (state_fd >= 0) {
 		rewind(state_f);
-		while (flock(state_fd, LOCK_EX) < 0) {
+		lock.l_type = F_WRLCK;
+		while (fcntl(state_fd, F_SETLKW, &lock) < 0) {
 			if ((errno == EAGAIN) || (errno == EINTR))
 				continue;
 			fclose(state_f);
@@ -366,7 +372,8 @@
 			fflush(state_f);
 		}
 		rewind(state_f);
-		flock(state_fd, LOCK_UN);
+		lock.l_type = F_UNLCK;
+		fcntl(state_fd, F_SETLK, &lock);
 	}
 
 	*clock_high = clock_reg >> 32;