diff --git a/configure b/configure
index b7a7703358..21f4520f81 100755
--- a/configure
+++ b/configure
@@ -16039,7 +16039,7 @@ fi
 LIBS_including_readline="$LIBS"
 LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
 
-for ac_func in backtrace_symbols clock_gettime copyfile fdatasync getifaddrs getpeerucred inet_pton kqueue mbstowcs_l memset_s posix_fallocate ppoll pthread_is_threaded_np setproctitle setproctitle_fast strchrnul strsignal syncfs sync_file_range uselocale wcstombs_l
+for ac_func in backtrace_symbols copyfile fdatasync getifaddrs getpeerucred inet_pton kqueue mbstowcs_l memset_s posix_fallocate ppoll pthread_is_threaded_np setproctitle setproctitle_fast strchrnul strsignal syncfs sync_file_range uselocale wcstombs_l
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
diff --git a/configure.ac b/configure.ac
index 2938c9c7de..a7ab660179 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1791,7 +1791,6 @@ LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
 
 AC_CHECK_FUNCS(m4_normalize([
 	backtrace_symbols
-	clock_gettime
 	copyfile
 	fdatasync
 	getifaddrs
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index dfee47a1a4..6505a84211 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -83,9 +83,6 @@
 /* Define to 1 if you have the `BIO_meth_new' function. */
 #undef HAVE_BIO_METH_NEW
 
-/* Define to 1 if you have the `clock_gettime' function. */
-#undef HAVE_CLOCK_GETTIME
-
 /* Define to 1 if your compiler handles computed gotos. */
 #undef HAVE_COMPUTED_GOTO
 
diff --git a/src/include/portability/instr_time.h b/src/include/portability/instr_time.h
index ca09a1608f..8faeca8b49 100644
--- a/src/include/portability/instr_time.h
+++ b/src/include/portability/instr_time.h
@@ -57,8 +57,6 @@
 
 #ifndef WIN32
 
-#ifdef HAVE_CLOCK_GETTIME
-
 /* Use clock_gettime() */
 
 #include <time.h>
@@ -141,72 +139,6 @@ typedef struct timespec instr_time;
 #define INSTR_TIME_GET_MICROSEC(t) \
 	(((uint64) (t).tv_sec * (uint64) 1000000) + (uint64) ((t).tv_nsec / 1000))
 
-#else							/* !HAVE_CLOCK_GETTIME */
-
-/* Use gettimeofday() */
-
-#include <sys/time.h>
-
-typedef struct timeval instr_time;
-
-#define INSTR_TIME_IS_ZERO(t)	((t).tv_usec == 0 && (t).tv_sec == 0)
-
-#define INSTR_TIME_SET_ZERO(t)	((t).tv_sec = 0, (t).tv_usec = 0)
-
-#define INSTR_TIME_SET_CURRENT(t)	gettimeofday(&(t), NULL)
-
-#define INSTR_TIME_ADD(x,y) \
-	do { \
-		(x).tv_sec += (y).tv_sec; \
-		(x).tv_usec += (y).tv_usec; \
-		/* Normalize */ \
-		while ((x).tv_usec >= 1000000) \
-		{ \
-			(x).tv_usec -= 1000000; \
-			(x).tv_sec++; \
-		} \
-	} while (0)
-
-#define INSTR_TIME_SUBTRACT(x,y) \
-	do { \
-		(x).tv_sec -= (y).tv_sec; \
-		(x).tv_usec -= (y).tv_usec; \
-		/* Normalize */ \
-		while ((x).tv_usec < 0) \
-		{ \
-			(x).tv_usec += 1000000; \
-			(x).tv_sec--; \
-		} \
-	} while (0)
-
-#define INSTR_TIME_ACCUM_DIFF(x,y,z) \
-	do { \
-		(x).tv_sec += (y).tv_sec - (z).tv_sec; \
-		(x).tv_usec += (y).tv_usec - (z).tv_usec; \
-		/* Normalize after each add to avoid overflow/underflow of tv_usec */ \
-		while ((x).tv_usec < 0) \
-		{ \
-			(x).tv_usec += 1000000; \
-			(x).tv_sec--; \
-		} \
-		while ((x).tv_usec >= 1000000) \
-		{ \
-			(x).tv_usec -= 1000000; \
-			(x).tv_sec++; \
-		} \
-	} while (0)
-
-#define INSTR_TIME_GET_DOUBLE(t) \
-	(((double) (t).tv_sec) + ((double) (t).tv_usec) / 1000000.0)
-
-#define INSTR_TIME_GET_MILLISEC(t) \
-	(((double) (t).tv_sec * 1000.0) + ((double) (t).tv_usec) / 1000.0)
-
-#define INSTR_TIME_GET_MICROSEC(t) \
-	(((uint64) (t).tv_sec * (uint64) 1000000) + (uint64) (t).tv_usec)
-
-#endif							/* HAVE_CLOCK_GETTIME */
-
 #else							/* WIN32 */
 
 /* Use QueryPerformanceCounter() */
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index dd9d1a58ad..bd8b755b96 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -228,7 +228,6 @@ sub GenerateFiles
 		HAVE_BACKTRACE_SYMBOLS     => undef,
 		HAVE_BIO_GET_DATA          => undef,
 		HAVE_BIO_METH_NEW          => undef,
-		HAVE_CLOCK_GETTIME         => undef,
 		HAVE_COMPUTED_GOTO         => undef,
 		HAVE_COPYFILE              => undef,
 		HAVE_COPYFILE_H            => undef,