diff --git a/src/backend/utils/adt/nabstime.c b/src/backend/utils/adt/nabstime.c
index 438b35df37..8385892078 100644
--- a/src/backend/utils/adt/nabstime.c
+++ b/src/backend/utils/adt/nabstime.c
@@ -7,7 +7,7 @@
  *
  *
  * IDENTIFICATION
- *    $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.12 1997/01/10 20:19:33 momjian Exp $
+ *    $Header: /cvsroot/pgsql/src/backend/utils/adt/nabstime.c,v 1.13 1997/01/27 01:51:21 scrappy Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -292,7 +292,7 @@ tryabsdate(char *fields[], int nf, struct tm *tm, int *tzp)
     (void) ftime(&now);
     *tzp = now.timezone;
 #else /* USE_POSIX_TIME */
-#ifdef HAVE_TZSET
+#if defined(HAVE_TZSET) && defined(HAVE_INT_TIMEZONE)
 	    tzset();
 #ifndef win32
     *tzp = timezone / 60;		/* this is an X/Open-ism */
diff --git a/src/include/config.h b/src/include/config.h
index 605fb434ef..04fd932d61 100644
--- a/src/include/config.h
+++ b/src/include/config.h
@@ -45,6 +45,8 @@
 #  define DISABLE_XOPEN_NLS 
 #  define NEED_UNION_SEMUN 
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  define HAVE_ANSI_CPP
 #  define HAS_TEST_AND_SET
    typedef unsigned int slock_t;
@@ -101,6 +103,7 @@
 #  define JMP_BUF
 #  define USE_POSIX_TIME
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
 #  undef HAVE_CBRT
 #  undef HAVE_RINT
 #  define NEED_UNION_SEMUN 
@@ -116,6 +119,8 @@
 #  undef HAVE_GETRUSAGE 
 #  define NO_EMPTY_STMTS
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  define NEED_UNION_SEMUN 
 #  define SYSV_DIRENT
 #  define HAS_TEST_AND_SET
@@ -129,6 +134,8 @@
 #  define NO_EMPTY_STMTS
 #  define NO_VFORK
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  define SYSV_DIRENT
 #  define HAS_TEST_AND_SET
 #  include <abi_mutex.h>
@@ -145,6 +152,8 @@
 #  define JMP_BUF
 #  define USE_POSIX_TIME
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  undef HAVE_CBRT
 #  define NEED_I386_TAS_ASM
 #  define HAS_TEST_AND_SET
@@ -190,6 +199,8 @@
 #  define NO_EMPTY_STMTS
 #  define USE_POSIX_TIME
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  define NEED_UNION_SEMUN 
 #  define SYSV_DIRENT
 #  define HAS_TEST_AND_SET
@@ -208,6 +219,8 @@ typedef unsigned char slock_t;
 #  undef HAVE_GETRUSAGE 
 #  define NO_EMPTY_STMTS
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  define NEED_UNION_SEMUN 
 #  define SYSV_DIRENT
 #endif
@@ -223,6 +236,8 @@ typedef unsigned char slock_t;
 #  define NOFILE	100
 #  define NEED_UNION_SEMUN
 #  define HAVE_TZSET
+#  define HAVE_INT_TIMEZONE
+#  undef HAVE_CBRT
 #  ifndef MAXPATHLEN
 #  define MAXPATHLEN    250
 #  endif