diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 3b615f8229..4030a11a52 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.112 2003/02/21 00:06:22 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/access/transam/xlog.c,v 1.113 2003/04/18 01:03:41 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1507,7 +1507,7 @@ InstallXLogFileSegment(uint32 log, uint32 seg, char *tmppath,
 	 * overwrite an existing logfile.  However, there shouldn't be one, so
 	 * rename() is an acceptable substitute except for the truly paranoid.
 	 */
-#if !defined(__BEOS__) && !defined(N_PLAT_NLM) && !defined(__CYGWIN__)
+#if HAVE_WORKING_LINK
 	if (link(tmppath, path) < 0)
 		elog(PANIC, "link from %s to %s (initialization of log file %u, segment %u) failed: %m",
 			 tmppath, path, log, seg);
diff --git a/src/backend/postmaster/postmaster.c b/src/backend/postmaster/postmaster.c
index e9df82a147..499c4f25ca 100644
--- a/src/backend/postmaster/postmaster.c
+++ b/src/backend/postmaster/postmaster.c
@@ -37,7 +37,7 @@
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.311 2003/04/17 22:26:01 tgl Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/postmaster/postmaster.c,v 1.312 2003/04/18 01:03:42 momjian Exp $
  *
  * NOTES
  *
@@ -299,9 +299,7 @@ checkDataDir(const char *checkdir)
 	char		path[MAXPGPATH];
 	FILE	   *fp;
 
-#ifndef __CYGWIN__
 	struct stat stat_buf;
-#endif
 
 	if (checkdir == NULL)
 	{
@@ -314,15 +312,6 @@ checkDataDir(const char *checkdir)
 		ExitPostmaster(2);
 	}
 
-	/*
-	 * Check if the directory has group or world access.  If so, reject.
-	 *
-	 * XXX temporarily suppress check when on Windows, because there may not
-	 * be proper support for Unix-y file permissions.  Need to think of a
-	 * reasonable check to apply on Windows.
-	 */
-#ifndef __CYGWIN__
-
 	if (stat(checkdir, &stat_buf) == -1)
 	{
 		if (errno == ENOENT)
@@ -332,10 +321,18 @@ checkDataDir(const char *checkdir)
 				 checkdir);
 	}
 
+	/*
+	 * Check if the directory has group or world access.  If so, reject.
+	 *
+	 * XXX temporarily suppress check when on Windows, because there may not
+	 * be proper support for Unix-y file permissions.  Need to think of a
+	 * reasonable check to apply on Windows.
+	 */
+#if !defined(__CYGWIN__) && !defined(WIN32)
 	if (stat_buf.st_mode & (S_IRWXG | S_IRWXO))
 		elog(FATAL, "data directory %s has group or world access; permissions should be u=rwx (0700)",
 			 checkdir);
-#endif   /* !__CYGWIN__ */
+#endif
 
 	/* Look for PG_VERSION before looking for pg_control */
 	ValidatePgVersion(checkdir);
diff --git a/src/include/c.h b/src/include/c.h
index 89d8012ba6..8b92a98793 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -12,7 +12,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: c.h,v 1.137 2003/04/06 22:45:23 petere Exp $
+ * $Id: c.h,v 1.138 2003/04/18 01:03:42 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -51,7 +51,7 @@
  */
 
 #include "pg_config.h"
-#include "pg_config_manual.h"
+#include "pg_config_manual.h"	/* must be after pg_config.h */
 #include "pg_config_os.h"
 #include "postgres_ext.h"
 
@@ -65,10 +65,8 @@
 #endif
 #include <sys/types.h>
 
-#ifdef __CYGWIN__
 #include <errno.h>
 #include <sys/fcntl.h>			/* ensure O_BINARY is available */
-#endif
 #ifdef HAVE_SUPPORTDEFS_H
 #include <SupportDefs.h>
 #endif
@@ -321,6 +319,14 @@ typedef unsigned long int uint64;
 #define HAVE_INT64_TIMESTAMP
 #endif
 
+/* Global variable holding time zone information. */
+#ifndef HAVE_UNDERSCORE_TIMEZONE
+#define TIMEZONE_GLOBAL timezone
+#else
+#define TIMEZONE_GLOBAL _timezone
+#define tzname _tzname			/* should be in time.h? */
+#endif
+
 /* sig_atomic_t is required by ANSI C, but may be missing on old platforms */
 #ifndef HAVE_SIG_ATOMIC_T
 typedef int sig_atomic_t;
@@ -680,7 +686,7 @@ typedef NameData *Name;
  * ----------------------------------------------------------------
  */
 
-#ifdef __CYGWIN__
+#if defined(__CYGWIN__) || defined(WIN32)
 #define PG_BINARY	O_BINARY
 #define PG_BINARY_R "rb"
 #define PG_BINARY_W "wb"
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 1629638ebe..2749395670 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -6,7 +6,7 @@
  * for developers.  If you edit any of these, be sure to do a *full*
  * rebuild (and an initdb if noted).
  *
- * $Id: pg_config_manual.h,v 1.1 2003/04/06 22:45:23 petere Exp $
+ * $Id: pg_config_manual.h,v 1.2 2003/04/18 01:03:42 momjian Exp $
  *------------------------------------------------------------------------
  */
 
@@ -134,6 +134,22 @@
 # define HAVE_UNIX_SOCKETS 1
 #endif
 
+/*
+ * Define this if your operating system supports link()
+ */
+#if !defined(__QNX__) && !defined(__BEOS__) && \
+	!defined(__CYGWIN__) && !defined(WIN32)
+# define HAVE_WORKING_LINK 1
+#endif
+  
+/*
+ * Define this if your operating system has _timezone rather than timezone
+ */
+#if defined(__CYGWIN__) || defined(WIN32)
+# define HAVE_INT_TIMEZONE		/* has int _timezone */
+# define HAVE_UNDERSCORE_TIMEZONE 1
+#endif
+  
 /*
  * This is the default directory in which AF_UNIX socket files are
  * placed.  Caution: changing this risks breaking your existing client
diff --git a/src/include/port/cygwin.h b/src/include/port/cygwin.h
index cb6d6ecc08..d3ae74b1bf 100644
--- a/src/include/port/cygwin.h
+++ b/src/include/port/cygwin.h
@@ -1,11 +1,10 @@
-/* $Header: /cvsroot/pgsql/src/include/port/cygwin.h,v 1.1 2003/03/21 17:18:34 petere Exp $ */
+/* $Header: /cvsroot/pgsql/src/include/port/cygwin.h,v 1.2 2003/04/18 01:03:42 momjian Exp $ */
+
+#include <port/win32defs.h>
 
 #define HAS_TEST_AND_SET
 typedef unsigned char slock_t;
 
-#define tzname _tzname			/* should be in time.h? */
-#define HAVE_INT_TIMEZONE		/* has int _timezone */
-
 #include <cygwin/version.h>
 
 /*
diff --git a/src/include/port/win32.h b/src/include/port/win32.h
index b9ef739e9c..a117be863a 100644
--- a/src/include/port/win32.h
+++ b/src/include/port/win32.h
@@ -1,3 +1,7 @@
+/* $Header: /cvsroot/pgsql/src/include/port/win32.h,v 1.7 2003/04/18 01:03:42 momjian Exp $ */
+
+#include <port/win32defs.h>
+
 #define USES_WINSOCK
 #define NOFILE		  100
 
@@ -27,3 +31,56 @@
 #define DLLIMPORT
 
 #endif
+
+/*
+ * Supplement to <sys/types.h>.
+ */
+#define uid_t int
+#define gid_t int
+#define pid_t unsigned long
+#define ssize_t int
+#define mode_t int
+#define key_t long
+#define ushort unsigned short
+
+/*
+ * Supplement to <sys/stat.h>.
+ */
+#define lstat slat
+
+#define S_ISDIR(m) (((m) & _S_IFMT) == _S_IFDIR)
+#define S_ISREG(m) (((m) & _S_IFMT) == _S_IFREG)
+
+#define S_IRUSR _S_IREAD
+#define S_IWUSR _S_IWRITE
+#define S_IXUSR _S_IEXEC
+#define S_IRWXU (_S_IREAD | _S_IWRITE | _S_IEXEC)
+
+/*
+ * Supplement to <errno.h>.
+ */
+#include <errno.h>
+#undef EAGAIN
+#undef EINTR
+#define EINTR WSAEINTR
+#define EAGAIN WSAEWOULDBLOCK
+#define EMSGSIZE WSAEMSGSIZE
+#define EAFNOSUPPORT WSAEAFNOSUPPORT
+#define EWOULDBLOCK WSAEWOULDBLOCK
+#define ECONNRESET WSAECONNRESET
+#define EINPROGRESS WSAEINPROGRESS
+
+/*
+ * Supplement to <math.h>.
+ */
+#define isnan _isnan
+#define finite _finite
+extern double rint(double x);
+
+/*
+ * Supplement to <stdio.h>.
+ */
+#define snprintf _snprintf
+#define vsnprintf _vsnprintf
+
+
diff --git a/src/include/utils/datetime.h b/src/include/utils/datetime.h
index 3a41961548..1f43ffbcea 100644
--- a/src/include/utils/datetime.h
+++ b/src/include/utils/datetime.h
@@ -9,7 +9,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: datetime.h,v 1.37 2003/04/04 04:50:44 tgl Exp $
+ * $Id: datetime.h,v 1.38 2003/04/18 01:03:42 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -216,13 +216,6 @@ do { \
 } while(0)
 #endif
 
-/* Global variable holding time zone information. */
-#if defined(__CYGWIN__) || defined(N_PLAT_NLM)
-#define TIMEZONE_GLOBAL _timezone
-#else
-#define TIMEZONE_GLOBAL timezone
-#endif
-
 /*
  * Date/time validation
  * Include check for leap year.
diff --git a/src/interfaces/ecpg/include/sqlca.h b/src/interfaces/ecpg/include/sqlca.h
index 0927f0a4d4..7987eb0d3c 100644
--- a/src/interfaces/ecpg/include/sqlca.h
+++ b/src/interfaces/ecpg/include/sqlca.h
@@ -2,7 +2,7 @@
 #define POSTGRES_SQLCA_H
 
 #ifndef DLLIMPORT
-#ifdef __CYGWIN__
+#if defined(__CYGWIN__) || defined(WIN32)
 #define DLLIMPORT __declspec (dllimport)
 #else
 #define DLLIMPORT
diff --git a/src/interfaces/ecpg/pgtypeslib/dt.h b/src/interfaces/ecpg/pgtypeslib/dt.h
index 8dce06d1bd..415cff0b20 100644
--- a/src/interfaces/ecpg/pgtypeslib/dt.h
+++ b/src/interfaces/ecpg/pgtypeslib/dt.h
@@ -216,10 +216,11 @@ do { \
 #endif
 
 /* Global variable holding time zone information. */
-#if defined(__CYGWIN__) || defined(N_PLAT_NLM)
-#define TIMEZONE_GLOBAL _timezone
-#else
+#if !defined(__CYGWIN__) && !defined(WIN32)
 #define TIMEZONE_GLOBAL timezone
+#else
+#define TIMEZONE_GLOBAL _timezone
+#define tzname _tzname			/* should be in time.h? */
 #endif
 
 /*
diff --git a/src/tools/entab/entab.c b/src/tools/entab/entab.c
index 4e7240ea42..fffeb70d31 100644
--- a/src/tools/entab/entab.c
+++ b/src/tools/entab/entab.c
@@ -12,6 +12,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include "../include/c.h"
+
 #define NUL				'\0'
 
 #ifndef TRUE
@@ -94,11 +96,7 @@ char	  **argv;
 			in_file = stdin;
 		else
 		{
-#ifndef __CYGWIN__
-			if ((in_file = fopen(*argv, "r")) == NULL)
-#else
-			if ((in_file = fopen(*argv, "rb")) == NULL)
-#endif
+			if ((in_file = fopen(*argv, PG_BINARY_R)) == NULL)
 				halt("PERROR:  Can not open file %s\n", argv[0]);
 			argv++;
 		}