diff --git a/CHANGES b/CHANGES
index 984d391..0a5d8ef 100644
--- a/CHANGES
+++ b/CHANGES
@@ -68,7 +68,11 @@ Documentation:
 	Thanks to Emanuele Torre for reporting this issue.
 
 	Corrected more typos and added missing bug info to CHANGES, performed
-	some non functional corrections
+	some non functional corrections.
+
+Porting:
+	Corrected building when clock_gettime() not available, with or without
+	gettimeofday().
 
 ####################### V 1.7.4.1:
 
diff --git a/config.h.in b/config.h.in
index 7292c01..62f10d3 100644
--- a/config.h.in
+++ b/config.h.in
@@ -156,6 +156,9 @@
 /* Define if you have the ftruncate64 function */
 #undef HAVE_FTRUNCATE64
 
+/* Define if you have the gettimeofday function */
+#undef HAVE_PROTOTYPE_LIB_gettimeofday
+
 /* Define if you have the clock_gettime function */
 #undef HAVE_CLOCK_GETTIME
 
diff --git a/configure.ac b/configure.ac
index b6b3cab..09dbb7a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-dnl source: configure.in
+dnl source: configure.ac
 dnl Copyright Gerhard Rieger and contributors (see file CHANGES)
 dnl Published under the GNU General Public License V.2, see file COPYING
 
@@ -1491,6 +1491,8 @@ AC_CHECK_LIB(bsd, openpty,
 AC_CHECK_LIB(util, openpty,
   [LIBS="-lutil $LIBS"; AC_DEFINE(HAVE_OPENPTY)])
 
+AC_CHECK_PROTOTYPE_LIB(gettimeofday)
+
 AC_CHECK_LIB(rt, clock_gettime,
 		 [LIBS="-lrt $LIBS"; AC_DEFINE(HAVE_CLOCK_GETTIME)])
 
diff --git a/error.c b/error.c
index b1ce8f6..1cff8d1 100644
--- a/error.c
+++ b/error.c
@@ -49,7 +49,7 @@ struct diag_opts diagopts =
 static void msg2(
 #if HAVE_CLOCK_GETTIME
 		 struct timespec *now,
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
 		 struct timeval *now,
 #else
 		 time_t *now,
@@ -269,7 +269,7 @@ void msg(int level, const char *format, ...) {
    diag_dgram.op = DIAG_OP_MSG;
 #if HAVE_CLOCK_GETTIME
    clock_gettime(CLOCK_REALTIME, &diag_dgram.now);
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
    gettimeofday(&diag_dgram.now, NULL);
 #else
    diag_dgram.now = time(NULL);
@@ -295,7 +295,7 @@ void msg(int level, const char *format, ...) {
 void msg2(
 #if HAVE_CLOCK_GETTIME
 	  struct timespec *now,
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
 	  struct timeval *now,
 #else
 	  time_t *now,
@@ -315,7 +315,7 @@ void msg2(
 
 #if HAVE_CLOCK_GETTIME
    epoch = now->tv_sec;
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
    epoch = now->tv_sec;
 #else
    epoch = *now;
@@ -329,7 +329,7 @@ void msg2(
    if (diagopts.micros) {
 #if HAVE_CLOCK_GETTIME
       micros = now->tv_nsec/1000;
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
       micros = now->tv_usec;
 #else
       micros = 0;
@@ -387,7 +387,7 @@ void diag_flush(void) {
 	 /* we want the actual time, not when this dgram was sent */
 #if HAVE_CLOCK_GETTIME
 	 clock_gettime(CLOCK_REALTIME, &recv_dgram.now);
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
 	 gettimeofday(&recv_dgram.now, NULL);
 #else
 	 recv_dgram.now = time(NULL);
diff --git a/error.h b/error.h
index c6a3048..32e5a59 100644
--- a/error.h
+++ b/error.h
@@ -217,7 +217,7 @@ struct diag_dgram {
    enum diag_op op;
 #if HAVE_CLOCK_GETTIME
    struct timespec now;
-#elif HAVE_GETTIMEOFDAY
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
    struct timeval now;
 #else
    time_t now;
diff --git a/socat.c b/socat.c
index efc9d3e..9e02129 100644
--- a/socat.c
+++ b/socat.c
@@ -1193,40 +1193,45 @@ int _socat(void) {
    returns 0 on success or -1 if an error occurred */
 int gettimestamp(char *timestamp) {
    size_t bytes;
-#if HAVE_GETTIMEOFDAY || 1
+#if HAVE_CLOCK_GETTIME
+   struct timespec now;
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
    struct timeval now;
-   int result;
+#endif /* !HAVE_PROTOTYPE_LIB_gettimeofday */
    time_t nowt;
-#else /* !HAVE_GETTIMEOFDAY */
-   time_t now;
-#endif /* !HAVE_GETTIMEOFDAY */
+   int result;
 
-#if HAVE_GETTIMEOFDAY || 1
-   result = gettimeofday(&now, NULL);
+#if HAVE_CLOCK_GETTIME
+   result = clock_gettime(CLOCK_REALTIME, &now);
    if (result < 0) {
       return result;
-   } else {
-      nowt = now.tv_sec;
-#if HAVE_STRFTIME
-      bytes = strftime(timestamp, 20, "%Y/%m/%d %H:%M:%S", localtime(&nowt));
-      bytes += sprintf(timestamp+19, "."F_tv_usec" ", now.tv_usec);
-#else
-      strcpy(timestamp, ctime(&nowt));
-      bytes = strlen(timestamp);
-#endif
    }
-#else /* !HAVE_GETTIMEOFDAY */
-   now = time(NULL);  if (now == (time_t)-1) {
+   nowt = now.tv_sec;
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
+   result = Gettimeofday(&now, NULL);
+   if (result < 0) {
+      return result;
+   }
+   nowt = now.tv_sec;
+#else
+   nowt = time(NULL);
+   if (nowt == (time_t)-1) {
       return -1;
-   } else {
-#if HAVE_STRFTIME
-      bytes = strftime(timestamp, 21, "%Y/%m/%d %H:%M:%S ", localtime(&now));
-#else
-      strcpy(timestamp, ctime(&now));
-      bytes = strlen(timestamp);
-#endif
    }
-#endif /* !HAVE_GETTIMEOFDAY */
+#endif
+#if HAVE_STRFTIME
+   bytes = strftime(timestamp, 20, "%Y/%m/%d %H:%M:%S", localtime(&nowt));
+#if HAVE_CLOCK_GETTIME
+   bytes += sprintf(timestamp+19, "."F_tv_usec" ", now.tv_nsec/1000);
+#elif HAVE_PROTOTYPE_LIB_gettimeofday
+   bytes += sprintf(timestamp+19, "."F_tv_usec" ", now.tv_usec);
+#else
+   strncpy(&timestamp[bytes++], " ", 2);
+#endif
+#else
+   strcpy(timestamp, ctime(&nowt));
+   bytes = strlen(timestamp);
+#endif
    return 0;
 }