diff --git a/src/backend/utils/adt/date.c b/src/backend/utils/adt/date.c
index ba1b7f6a4d..a19ae9e48a 100644
--- a/src/backend/utils/adt/date.c
+++ b/src/backend/utils/adt/date.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.50 2000/09/12 05:41:37 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/date.c,v 1.51 2000/10/29 13:17:33 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -232,7 +232,7 @@ date_timestamp(PG_FUNCTION_ARGS)
 
 	if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
 	{
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 		tm->tm_hour = 0;
 		tm->tm_min = 0;
 		tm->tm_sec = 0;
@@ -245,7 +245,7 @@ date_timestamp(PG_FUNCTION_ARGS)
 			elog(ERROR, "Unable to convert date to tm");
 
 		result = utime + ((date2j(1970,1,1)-date2j(2000,1,1))*86400.0);
-#else							/* !USE_POSIX_TIME */
+#else
 		result = dateVal*86400.0+CTimeZone;
 #endif
 	}
diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c
index 39a39c479d..a4c1abb9ee 100644
--- a/src/backend/utils/adt/datetime.c
+++ b/src/backend/utils/adt/datetime.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.53 2000/09/12 05:41:37 thomas Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.54 2000/10/29 13:17:33 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -19,13 +19,8 @@
 #include <sys/types.h>
 #include <errno.h>
 #include <float.h>
-
 #include <limits.h>
 
-#ifndef USE_POSIX_TIME
-#include <sys/timeb.h>
-#endif
-
 #include "miscadmin.h"
 #include "utils/datetime.h"
 
@@ -885,7 +880,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
 
 			if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
 			{
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 				tm->tm_year -= 1900;
 				tm->tm_mon -= 1;
 				tm->tm_isdst = -1;
@@ -893,20 +888,18 @@ DecodeDateTime(char **field, int *ftype, int nf,
 				tm->tm_year += 1900;
 				tm->tm_mon += 1;
 
-#if defined(HAVE_TM_ZONE)
+# if defined(HAVE_TM_ZONE)
 				*tzp = -(tm->tm_gmtoff);		/* tm_gmtoff is
 												 * Sun/DEC-ism */
-#elif defined(HAVE_INT_TIMEZONE)
-#ifdef __CYGWIN__
+# elif defined(HAVE_INT_TIMEZONE)
+#  ifdef __CYGWIN__
 				*tzp = ((tm->tm_isdst > 0) ? (_timezone - 3600) : _timezone);
-#else
+#  else
 				*tzp = ((tm->tm_isdst > 0) ? (timezone - 3600) : timezone);
-#endif
-#else
-#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
-#endif
+#  endif /* __CYGWIN__ */
+# endif /* HAVE_INT_TIMEZONE */
 
-#else							/* !USE_POSIX_TIME */
+#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
 				*tzp = CTimeZone;
 #endif
 			}
@@ -1139,24 +1132,22 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
 		tmp->tm_min = tm->tm_min;
 		tmp->tm_sec = tm->tm_sec;
 
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 		tmp->tm_isdst = -1;
 		mktime(tmp);
 		tm->tm_isdst = tmp->tm_isdst;
 
-#if defined(HAVE_TM_ZONE)
+# if defined(HAVE_TM_ZONE)
 		*tzp = -(tmp->tm_gmtoff);		/* tm_gmtoff is Sun/DEC-ism */
-#elif defined(HAVE_INT_TIMEZONE)
-#ifdef __CYGWIN__
+# elif defined(HAVE_INT_TIMEZONE)
+#  ifdef __CYGWIN__
 		*tzp = ((tmp->tm_isdst > 0) ? (_timezone - 3600) : _timezone);
-#else
+#  else
 		*tzp = ((tmp->tm_isdst > 0) ? (timezone - 3600) : timezone);
-#endif
-#else
-#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
-#endif
+#  endif
+# endif
 
-#else							/* !USE_POSIX_TIME */
+#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
 		*tzp = CTimeZone;
 #endif
 	}
diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c
index 748bb694d7..b1e412907d 100644
--- a/src/backend/utils/adt/formatting.c
+++ b/src/backend/utils/adt/formatting.c
@@ -1,7 +1,7 @@
 /* -----------------------------------------------------------------------
  * formatting.c
  *
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v 1.22 2000/09/25 12:58:47 momjian Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/formatting.c,v 1.23 2000/10/29 13:17:34 petere Exp $
  *
  *
  *	 Portions Copyright (c) 1999-2000, PostgreSQL, Inc
@@ -2781,34 +2781,32 @@ to_timestamp(PG_FUNCTION_ARGS)
 	if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
 	{
 
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 		tm->tm_isdst = -1;
 		tm->tm_year -= 1900;
 		tm->tm_mon -= 1;
 
-#ifdef DEBUG_TO_FROM_CHAR
+# ifdef DEBUG_TO_FROM_CHAR
 		elog(DEBUG_elog_output, "TO-FROM_CHAR: Call mktime()");
 		NOTICE_TM;
-#endif
+# endif
 		mktime(tm);
 		tm->tm_year += 1900;
 		tm->tm_mon += 1;
 
-#if defined(HAVE_TM_ZONE)
+# if defined(HAVE_TM_ZONE)
 		tz = -(tm->tm_gmtoff);	/* tm_gmtoff is Sun/DEC-ism */
-#elif defined(HAVE_INT_TIMEZONE)
+# elif defined(HAVE_INT_TIMEZONE)
 
-#ifdef __CYGWIN__
+#  ifdef __CYGWIN__
 		tz = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
-#else
+#  else
 		tz = (tm->tm_isdst ? (timezone - 3600) : timezone);
-#endif
+#  endif
 
-#else
-#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
-#endif
+# endif
 
-#else							/* !USE_POSIX_TIME */
+#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
 		tz = CTimeZone;
 #endif
 	}
diff --git a/src/backend/utils/adt/nabstime.c b/src/backend/utils/adt/nabstime.c
index 61973c46cf..a7ee883f7b 100644
--- a/src/backend/utils/adt/nabstime.c
+++ b/src/backend/utils/adt/nabstime.c
@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.74 2000/09/29 13:53:31 petere Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.75 2000/10/29 13:17:34 petere Exp $
  *
  * NOTES
  *
@@ -24,7 +24,7 @@
 #include <float.h>
 #include <limits.h>
 
-#ifndef USE_POSIX_TIME
+#if !(defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE))
 #include <sys/timeb.h>
 #endif
 
@@ -126,11 +126,11 @@ GetCurrentAbsoluteTime(void)
 {
 	time_t		now;
 
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 	struct tm  *tm;
 
 	now = time(NULL);
-#else							/* ! USE_POSIX_TIME */
+#else
 	struct timeb tb;			/* the old V7-ism */
 
 	ftime(&tb);
@@ -139,7 +139,6 @@ GetCurrentAbsoluteTime(void)
 
 	if (!HasCTZSet)
 	{
-#ifdef USE_POSIX_TIME
 #if defined(HAVE_TM_ZONE)
 		tm = localtime(&now);
 
@@ -166,16 +165,13 @@ GetCurrentAbsoluteTime(void)
 
 		CDayLight = tm->tm_isdst;
 		CTimeZone =
-#ifdef __CYGWIN__
+# ifdef __CYGWIN__
 			(tm->tm_isdst ? (_timezone - 3600) : _timezone);
-#else
+# else
 			(tm->tm_isdst ? (timezone - 3600) : timezone);
-#endif
+# endif
 		strcpy(CTZName, tzname[tm->tm_isdst]);
-#else
-#error USE_POSIX_TIME defined but no time zone available
-#endif
-#else							/* ! USE_POSIX_TIME */
+#else /* neither HAVE_TM_ZONE nor HAVE_INT_TIMEZONE */
 		CTimeZone = tb.timezone * 60;
 		CDayLight = (tb.dstflag != 0);
 
@@ -206,25 +202,23 @@ void
 abstime2tm(AbsoluteTime _time, int *tzp, struct tm * tm, char *tzn)
 {
 	time_t time = (time_t) _time;
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 	struct tm  *tx;
 
-#else							/* ! USE_POSIX_TIME */
+#else
 	struct timeb tb;			/* the old V7-ism */
 
 	ftime(&tb);
 #endif
 
-#ifdef USE_POSIX_TIME
+
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 	if (tzp != NULL)
 		tx = localtime((time_t *) &time);
 	else
 	{
 		tx = gmtime((time_t *) &time);
 	};
-#endif
-
-#ifdef USE_POSIX_TIME
 
 	tm->tm_year = tx->tm_year + 1900;
 	tm->tm_mon = tx->tm_mon + 1;
@@ -234,7 +228,7 @@ abstime2tm(AbsoluteTime _time, int *tzp, struct tm * tm, char *tzn)
 	tm->tm_sec = tx->tm_sec;
 	tm->tm_isdst = tx->tm_isdst;
 
-#if defined(HAVE_TM_ZONE)
+# if defined(HAVE_TM_ZONE)
 	tm->tm_gmtoff = tx->tm_gmtoff;
 	tm->tm_zone = tx->tm_zone;
 
@@ -252,13 +246,13 @@ abstime2tm(AbsoluteTime _time, int *tzp, struct tm * tm, char *tzn)
 		if (strlen(tm->tm_zone) > MAXTZLEN)
 			elog(NOTICE, "Invalid timezone \'%s\'", tm->tm_zone);
 	}
-#elif defined(HAVE_INT_TIMEZONE)
+# elif defined(HAVE_INT_TIMEZONE)
 	if (tzp != NULL)
-#ifdef __CYGWIN__
+#  ifdef __CYGWIN__
 		*tzp = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
-#else
+#  else
 		*tzp = (tm->tm_isdst ? (timezone - 3600) : timezone);
-#endif
+#  endif
 	if (tzn != NULL)
 	{
 
@@ -270,10 +264,8 @@ abstime2tm(AbsoluteTime _time, int *tzp, struct tm * tm, char *tzn)
 		if (strlen(tzname[tm->tm_isdst]) > MAXTZLEN)
 			elog(NOTICE, "Invalid timezone \'%s\'", tzname[tm->tm_isdst]);
 	}
-#else
-#error POSIX time support is broken
-#endif
-#else							/* ! USE_POSIX_TIME */
+# endif
+#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
 	if (tzp != NULL)
 		*tzp = tb.timezone * 60;
 
diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index 8894f60d54..21fd9d7618 100644
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.35 2000/08/29 04:41:47 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.36 2000/10/29 13:17:34 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -22,10 +22,6 @@
 #include <float.h>
 #include <limits.h>
 
-#ifndef USE_POSIX_TIME
-#include <sys/timeb.h>
-#endif
-
 #include "access/hash.h"
 #include "access/xact.h"
 #include "miscadmin.h"
@@ -282,7 +278,7 @@ timestamp2tm(Timestamp dt, int *tzp, struct tm * tm, double *fsec, char **tzn)
 				sec;
 	time_t		utime;
 
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 	struct tm  *tx;
 
 #endif
@@ -317,7 +313,7 @@ timestamp2tm(Timestamp dt, int *tzp, struct tm * tm, double *fsec, char **tzn)
 		{
 			utime = (dt + (date0 - date2j(1970, 1, 1)) * 86400);
 
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 			tx = localtime(&utime);
 			tm->tm_year = tx->tm_year + 1900;
 			tm->tm_mon = tx->tm_mon + 1;
@@ -336,26 +332,24 @@ timestamp2tm(Timestamp dt, int *tzp, struct tm * tm, double *fsec, char **tzn)
 #endif
 			tm->tm_isdst = tx->tm_isdst;
 
-#if defined(HAVE_TM_ZONE)
+# if defined(HAVE_TM_ZONE)
 			tm->tm_gmtoff = tx->tm_gmtoff;
 			tm->tm_zone = tx->tm_zone;
 
 			*tzp = -(tm->tm_gmtoff);	/* tm_gmtoff is Sun/DEC-ism */
 			if (tzn != NULL)
 				*tzn = (char *) tm->tm_zone;
-#elif defined(HAVE_INT_TIMEZONE)
-#ifdef __CYGWIN__
+# elif defined(HAVE_INT_TIMEZONE)
+#  ifdef __CYGWIN__
 			*tzp = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
-#else
+#  else
 			*tzp = (tm->tm_isdst ? (timezone - 3600) : timezone);
-#endif
+#  endif
 			if (tzn != NULL)
 				*tzn = tzname[(tm->tm_isdst > 0)];
-#else
-#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
-#endif
+# endif
 
-#else							/* !USE_POSIX_TIME */
+#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
 			*tzp = CTimeZone;	/* V7 conventions; don't know timezone? */
 			if (tzn != NULL)
 				*tzn = CTZName;
@@ -1629,7 +1623,7 @@ timestamp_trunc(PG_FUNCTION_ARGS)
 
 			if (IS_VALID_UTIME(tm->tm_year, tm->tm_mon, tm->tm_mday))
 			{
-#ifdef USE_POSIX_TIME
+#if defined(HAVE_TM_ZONE) || defined(HAVE_INT_TIMEZONE)
 				tm->tm_isdst = -1;
 				tm->tm_year -= 1900;
 				tm->tm_mon -= 1;
@@ -1638,21 +1632,19 @@ timestamp_trunc(PG_FUNCTION_ARGS)
 				tm->tm_year += 1900;
 				tm->tm_mon += 1;
 
-#if defined(HAVE_TM_ZONE)
+# if defined(HAVE_TM_ZONE)
 				tz = -(tm->tm_gmtoff);	/* tm_gmtoff is Sun/DEC-ism */
-#elif defined(HAVE_INT_TIMEZONE)
+# elif defined(HAVE_INT_TIMEZONE)
 
-#ifdef __CYGWIN__
+#  ifdef __CYGWIN__
 				tz = (tm->tm_isdst ? (_timezone - 3600) : _timezone);
-#else
+#  else
 				tz = (tm->tm_isdst ? (timezone - 3600) : timezone);
-#endif
+#  endif
 
-#else
-#error USE_POSIX_TIME is defined but neither HAVE_TM_ZONE or HAVE_INT_TIMEZONE are defined
-#endif
+# endif
 
-#else							/* !USE_POSIX_TIME */
+#else /* not (HAVE_TM_ZONE || HAVE_INT_TIMEZONE) */
 				tz = CTimeZone;
 #endif
 			}
diff --git a/src/include/port/aix.h b/src/include/port/aix.h
index 39c9a79a9c..782d84bb91 100644
--- a/src/include/port/aix.h
+++ b/src/include/port/aix.h
@@ -1,4 +1,3 @@
-#define USE_POSIX_TIME
 #define CLASS_CONFLICT
 #define DISABLE_XOPEN_NLS
 #define HAS_TEST_AND_SET
diff --git a/src/include/port/beos.h b/src/include/port/beos.h
index b27015d46e..0618dc3ffd 100644
--- a/src/include/port/beos.h
+++ b/src/include/port/beos.h
@@ -1,7 +1,6 @@
 #include <kernel/OS.h>
 #include "kernel/image.h"
 
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 
 typedef unsigned char slock_t;
diff --git a/src/include/port/bsdi.h b/src/include/port/bsdi.h
index bb6cbb801e..f486536113 100644
--- a/src/include/port/bsdi.h
+++ b/src/include/port/bsdi.h
@@ -5,7 +5,6 @@
 #define NEED_SPARC_TAS_ASM
 #endif
 
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 
 typedef unsigned char slock_t;
diff --git a/src/include/port/dgux.h b/src/include/port/dgux.h
index f08580cfaf..d8fd311e69 100644
--- a/src/include/port/dgux.h
+++ b/src/include/port/dgux.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #ifndef			BIG_ENDIAN
 #define			BIG_ENDIAN		4321
 #endif
diff --git a/src/include/port/freebsd.h b/src/include/port/freebsd.h
index 162ff5acfd..ec92644a15 100644
--- a/src/include/port/freebsd.h
+++ b/src/include/port/freebsd.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #if defined(__i386__)
 #define NEED_I386_TAS_ASM
 #define HAS_TEST_AND_SET
diff --git a/src/include/port/hpux.h b/src/include/port/hpux.h
index b265d4173f..870b12f263 100644
--- a/src/include/port/hpux.h
+++ b/src/include/port/hpux.h
@@ -1,4 +1,3 @@
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 typedef struct
 {
diff --git a/src/include/port/irix5.h b/src/include/port/irix5.h
index 8451ee95d8..6687960049 100644
--- a/src/include/port/irix5.h
+++ b/src/include/port/irix5.h
@@ -1,3 +1,2 @@
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 typedef unsigned long slock_t;
diff --git a/src/include/port/linux.h b/src/include/port/linux.h
index 366932122c..b6eb10f3d6 100644
--- a/src/include/port/linux.h
+++ b/src/include/port/linux.h
@@ -1,11 +1,3 @@
-/* __USE_POSIX, __USE_BSD, and __USE_BSD_SIGNAL used to be defined either
-   here or with -D compile options, but __ macros should be set and used by C
-   library macros, not Postgres code.  __USE_POSIX is set by features.h,
-   __USE_BSD is set by bsd/signal.h, and __USE_BSD_SIGNAL appears not to
-   be used.
-*/
-#define USE_POSIX_TIME
-
 #if defined(__i386__)
 typedef unsigned char slock_t;
 
@@ -42,13 +34,3 @@ typedef unsigned int slock_t;
 #define HAS_TEST_AND_SET
 
 #endif
-
-#if defined(__GLIBC__) && (__GLIBC__ >= 2)
-#ifdef HAVE_INT_TIMEZONE
-#undef HAVE_INT_TIMEZONE
-#endif
-#endif
-
-#if defined(__powerpc__)
-#undef HAVE_INT_TIMEZONE
-#endif
diff --git a/src/include/port/netbsd.h b/src/include/port/netbsd.h
index dc01930325..63e4236248 100644
--- a/src/include/port/netbsd.h
+++ b/src/include/port/netbsd.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #if defined(__i386__)
 #define NEED_I386_TAS_ASM
 #define HAS_TEST_AND_SET
diff --git a/src/include/port/openbsd.h b/src/include/port/openbsd.h
index dc01930325..63e4236248 100644
--- a/src/include/port/openbsd.h
+++ b/src/include/port/openbsd.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #if defined(__i386__)
 #define NEED_I386_TAS_ASM
 #define HAS_TEST_AND_SET
diff --git a/src/include/port/osf.h b/src/include/port/osf.h
index 6c0d7b2afd..c43671811d 100644
--- a/src/include/port/osf.h
+++ b/src/include/port/osf.h
@@ -1,5 +1,4 @@
 #define NOFIXADE
-#define USE_POSIX_TIME
 #define DISABLE_XOPEN_NLS
 #define HAS_TEST_AND_SET
 /*#include <sys/mman.h>*/			/* for msemaphore */
diff --git a/src/include/port/qnx4.h b/src/include/port/qnx4.h
index d60555f104..54cbbb6fb3 100644
--- a/src/include/port/qnx4.h
+++ b/src/include/port/qnx4.h
@@ -9,7 +9,6 @@
 #include <semaphore.h>			/* for sem_t */
 #endif
 
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 #define HAVE_STRING_H
 
diff --git a/src/include/port/sco.h b/src/include/port/sco.h
index 2b1187e7ea..04d3a506d6 100644
--- a/src/include/port/sco.h
+++ b/src/include/port/sco.h
@@ -4,8 +4,6 @@
 
 #define DISABLE_COMPLEX_MACRO
 
-#define USE_POSIX_TIME
-
 #define HAS_TEST_AND_SET
 #define NEED_I386_TAS_ASM
 
diff --git a/src/include/port/solaris.h b/src/include/port/solaris.h
index 388e9f8b41..6851b6ce04 100644
--- a/src/include/port/solaris.h
+++ b/src/include/port/solaris.h
@@ -1,6 +1,5 @@
-/* $Header: /cvsroot/pgsql/src/include/port/solaris.h,v 1.2 2000/10/28 22:53:17 petere Exp $ */
+/* $Header: /cvsroot/pgsql/src/include/port/solaris.h,v 1.3 2000/10/29 13:17:34 petere Exp $ */
 
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 typedef unsigned char slock_t;
 
diff --git a/src/include/port/sunos4.h b/src/include/port/sunos4.h
index e9c0ec29d4..06c5ba99e3 100644
--- a/src/include/port/sunos4.h
+++ b/src/include/port/sunos4.h
@@ -1,4 +1,3 @@
-#define USE_POSIX_TIME
 #define HAS_TEST_AND_SET
 typedef unsigned char slock_t;
 
diff --git a/src/include/port/svr4.h b/src/include/port/svr4.h
index b6ca301e99..2c6e2b4e71 100644
--- a/src/include/port/svr4.h
+++ b/src/include/port/svr4.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #ifndef			BYTE_ORDER
 #ifdef			MIPSEB
 #define			BYTE_ORDER		BIG_ENDIAN
diff --git a/src/include/port/ultrix4.h b/src/include/port/ultrix4.h
index b88b701503..2dbbe6ceec 100644
--- a/src/include/port/ultrix4.h
+++ b/src/include/port/ultrix4.h
@@ -1,5 +1,4 @@
 #define NOFIXADE
-#define USE_POSIX_TIME
 #define NEED_STRDUP
 
 #ifndef			BIG_ENDIAN
diff --git a/src/include/port/univel.h b/src/include/port/univel.h
index 4f9853d52b..f51729448d 100644
--- a/src/include/port/univel.h
+++ b/src/include/port/univel.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #define HAS_TEST_AND_SET
 #define NEED_I386_TAS_ASM
 
diff --git a/src/include/port/unixware.h b/src/include/port/unixware.h
index 00fe4501c2..380a19078f 100644
--- a/src/include/port/unixware.h
+++ b/src/include/port/unixware.h
@@ -1,5 +1,3 @@
-#define USE_POSIX_TIME
-
 #define HAS_TEST_AND_SET
 #define NEED_I386_TAS_ASM
 
diff --git a/src/include/port/win.h b/src/include/port/win.h
index f30979fd22..bae6de53f6 100644
--- a/src/include/port/win.h
+++ b/src/include/port/win.h
@@ -6,7 +6,6 @@ typedef unsigned char slock_t;
 #endif
 
 #define tzname _tzname			/* should be in time.h? */
-#define USE_POSIX_TIME
 #define HAVE_INT_TIMEZONE		/* has int _timezone */
 
 #include <cygwin/version.h>