PostgreSQL includes its own copy of the zic timezone database, which is great
for ensuring portable results but not so great from a package maintenance
perspective.  Since the data is in the same format as is provided by the
Linux-standard /usr/share/zoneinfo files, we can avoid having to update
postgresql for timezone updates by just using those files instead.

Note: as of PG 8.3 this patch will be unnecessary; use configure's
--with-system-tzdata switch instead.


diff -Naur postgresql-8.2.4.orig/src/timezone/Makefile postgresql-8.2.4/src/timezone/Makefile
--- postgresql-8.2.4.orig/src/timezone/Makefile	2007-03-14 13:38:15.000000000 -0400
+++ postgresql-8.2.4/src/timezone/Makefile	2007-08-25 16:38:53.000000000 -0400
@@ -38,14 +38,12 @@
 	$(CC) $(CFLAGS) $(ZICOBJS) $(LDFLAGS) $(LIBS) -o $@$(X)
 
 install: all installdirs
-	./zic -d '$(DESTDIR)$(datadir)/timezone' -p '$(POSIXRULES)' $(TZDATAFILES)
 	$(MAKE) -C tznames $@
 
 installdirs:
 	$(mkinstalldirs) '$(DESTDIR)$(datadir)'
 
 uninstall:
-	rm -rf '$(DESTDIR)$(datadir)/timezone'
 	$(MAKE) -C tznames $@
 
 clean distclean maintainer-clean:
diff -Naur postgresql-8.2.4.orig/src/timezone/pgtz.c postgresql-8.2.4/src/timezone/pgtz.c
--- postgresql-8.2.4.orig/src/timezone/pgtz.c	2006-11-21 18:11:55.000000000 -0500
+++ postgresql-8.2.4/src/timezone/pgtz.c	2007-08-25 16:42:32.000000000 -0400
@@ -31,9 +31,6 @@
 pg_tz	   *global_timezone = NULL;
 
 
-static char tzdir[MAXPGPATH];
-static bool done_tzdir = false;
-
 static bool scan_directory_ci(const char *dirname,
 							  const char *fname, int fnamelen,
 							  char *canonname, int canonnamelen);
@@ -45,17 +42,10 @@
 /*
  * Return full pathname of timezone data directory
  */
-static char *
+static const char *
 pg_TZDIR(void)
 {
-	if (done_tzdir)
-		return tzdir;
-
-	get_share_path(my_exec_path, tzdir);
-	strlcpy(tzdir + strlen(tzdir), "/timezone", MAXPGPATH - strlen(tzdir));
-
-	done_tzdir = true;
-	return tzdir;
+	return "/usr/share/zoneinfo";
 }