diff -up postfix-2.5.1/src/global/mail_dict.c.open_define postfix-2.5.1/src/global/mail_dict.c
--- postfix-2.5.1/src/global/mail_dict.c.open_define	2008-01-08 16:07:47.000000000 -0500
+++ postfix-2.5.1/src/global/mail_dict.c	2008-08-28 17:26:30.000000000 -0400
@@ -64,5 +64,5 @@ void    mail_dict_init(void)
     const DICT_OPEN_INFO *dp;
 
     for (dp = dict_open_info; dp->type; dp++)
-	dict_open_register(dp->type, dp->open);
+	dict_open_register(dp->type, (dp->open));
 }
diff -up postfix-2.5.1/src/global/mkmap_cdb.c.open_define postfix-2.5.1/src/global/mkmap_cdb.c
--- postfix-2.5.1/src/global/mkmap_cdb.c.open_define	2004-12-08 18:58:05.000000000 -0500
+++ postfix-2.5.1/src/global/mkmap_cdb.c	2008-08-28 17:25:23.000000000 -0400
@@ -56,7 +56,7 @@
 MKMAP *mkmap_cdb_open(const char *unused_path)
 {
     MKMAP  *mkmap = (MKMAP *) mymalloc(sizeof(*mkmap));
-    mkmap->open = dict_cdb_open;
+    (mkmap->open) = dict_cdb_open;
     mkmap->after_open = 0;
     mkmap->after_close = 0;
     return (mkmap);
diff -up postfix-2.5.1/src/global/mkmap_open.c.open_define postfix-2.5.1/src/global/mkmap_open.c
--- postfix-2.5.1/src/global/mkmap_open.c.open_define	2008-01-08 17:08:45.000000000 -0500
+++ postfix-2.5.1/src/global/mkmap_open.c	2008-08-28 17:25:23.000000000 -0400
@@ -181,7 +181,7 @@ MKMAP  *mkmap_open(const char *type, con
      * Truncate the database upon open, and update it. Read-write mode is
      * needed because the underlying routines read as well as write.
      */
-    mkmap->dict = mkmap->open(path, open_flags, dict_flags);
+    mkmap->dict = (mkmap->open)(path, open_flags, dict_flags);
     mkmap->dict->lock_fd = -1;			/* XXX just in case */
     mkmap->dict->stat_fd = -1;			/* XXX just in case */
     mkmap->dict->flags |= DICT_FLAG_DUP_WARN;
diff -up postfix-2.5.1/src/util/dict_db.c.open_define postfix-2.5.1/src/util/dict_db.c
--- postfix-2.5.1/src/util/dict_db.c.open_define	2007-01-04 09:06:07.000000000 -0500
+++ postfix-2.5.1/src/util/dict_db.c	2008-08-28 17:25:23.000000000 -0400
@@ -665,10 +665,10 @@ static DICT *dict_db_open(const char *cl
     if (type == DB_HASH && db->set_h_nelem(db, DICT_DB_NELM) != 0)
 	msg_fatal("set DB hash element count %d: %m", DICT_DB_NELM);
 #if (DB_VERSION_MAJOR == 4 && DB_VERSION_MINOR > 0)
-    if ((errno = db->open(db, 0, db_path, 0, type, db_flags, 0644)) != 0)
+    if ((errno = (db->open)(db, 0, db_path, 0, type, db_flags, 0644)) != 0)
 	msg_fatal("open database %s: %m", db_path);
 #elif (DB_VERSION_MAJOR == 3 || DB_VERSION_MAJOR == 4)
-    if ((errno = db->open(db, db_path, 0, type, db_flags, 0644)) != 0)
+    if ((errno = (db->open)(db, db_path, 0, type, db_flags, 0644)) != 0)
 	msg_fatal("open database %s: %m", db_path);
 #else
 #error "Unsupported Berkeley DB version"
diff -up postfix-2.5.1/src/util/dict_open.c.open_define postfix-2.5.1/src/util/dict_open.c
--- postfix-2.5.1/src/util/dict_open.c.open_define	2008-01-08 16:05:20.000000000 -0500
+++ postfix-2.5.1/src/util/dict_open.c	2008-08-28 17:25:23.000000000 -0400
@@ -305,7 +305,7 @@ DICT   *dict_open3(const char *dict_type
 	dict_open_init();
     if ((dp = (DICT_OPEN_INFO *) htable_find(dict_open_hash, dict_type)) == 0)
 	msg_fatal("unsupported dictionary type: %s", dict_type);
-    if ((dict = dp->open(dict_name, open_flags, dict_flags)) == 0)
+    if ((dict = (dp->open)(dict_name, open_flags, dict_flags)) == 0)
 	msg_fatal("opening %s:%s %m", dict_type, dict_name);
     if (msg_verbose)
 	msg_info("%s: %s:%s", myname, dict_type, dict_name);
@@ -326,7 +326,7 @@ void    dict_open_register(const char *t
 	msg_panic("%s: dictionary type exists: %s", myname, type);
     dp = (DICT_OPEN_INFO *) mymalloc(sizeof(*dp));
     dp->type = mystrdup(type);
-    dp->open = open;
+    (dp->open) = open;
     htable_enter(dict_open_hash, dp->type, (char *) dp);
 }