diff --git a/harbour/ChangeLog b/harbour/ChangeLog
index 516129fdc2..f594b1099f 100644
--- a/harbour/ChangeLog
+++ b/harbour/ChangeLog
@@ -8,6 +8,17 @@
    2008-12-31 13:59 UTC+0100 Foo Bar <foo.bar@foobar.org>
 */
 
+2008-08-17 09:48 UTC+0200 Viktor Szakats (harbour.01 syenar hu)
+   * include/hbapirdd.h
+   * include/hbsetup.h
+     + Added the most commonly used old #defines for compatibility:
+       - HARBOUR_MAX_RDD_DRIVERNAME_LENGTH
+       - HARBOUR_MAX_RDD_ALIAS_LENGTH
+       - OS_UNIX_COMPATIBLE
+       - OS_PATH_DELIMITER
+       Please try not to use these anymore, as they will be removed 
+       in version 1.1.
+
 2008-08-17 08:59 UTC+0200 Viktor Szakats (harbour.01 syenar hu)
    * doc/dirstruc.txt
      * Updated to reflect current state. [Chen Kedem]
diff --git a/harbour/include/hbapirdd.h b/harbour/include/hbapirdd.h
index 240b7b6dab..d09e00d5f7 100644
--- a/harbour/include/hbapirdd.h
+++ b/harbour/include/hbapirdd.h
@@ -66,9 +66,15 @@ HB_EXTERN_BEGIN
    #define HB_RDD_MAX_ALIAS_LEN            32
 #endif
 
-/* #define HARBOUR_MAX_RDD_FIELDNAME_LENGTH        32 */
+/* #define HB_MAX_RDD_FIELDNAME_LEN        32 */
 #define HB_RDD_MAX_AREA_NUM                65535
 
+/* Some compatibility #defines. This will be removed, 
+   please use the new names in your code. */
+#define HARBOUR_MAX_RDD_DRIVERNAME_LENGTH  HB_RDD_MAX_DRIVERNAME_LEN
+#define HARBOUR_MAX_RDD_ALIAS_LENGTH       HB_RDD_MAX_ALIAS_LEN
+
+
 /* DBCMD errors */
 
 #define EDBCMD_SEEK_BADPARAMETER          1001
diff --git a/harbour/include/hbsetup.h b/harbour/include/hbsetup.h
index 507e3be0bf..7e007763cd 100644
--- a/harbour/include/hbsetup.h
+++ b/harbour/include/hbsetup.h
@@ -230,6 +230,15 @@
 
 #define HB_ISOPTSEP( c ) ( strchr( HB_OS_OPT_DELIM_LIST, ( c ) ) != NULL )
 
+/* Some compatibility #defines. This will be removed, 
+   please use the new names in your code. */
+#ifndef OS_UNIX_COMPATIBLE
+#define OS_UNIX_COMPATIBLE              HB_OS_UNIX_COMPATIBLE
+#endif
+#ifndef OS_PATH_DELIMITER
+#define OS_PATH_DELIMITER               HB_OS_PATH_DELIM_CHR
+#endif
+
 /* ***********************************************************************
  * Platform detection
  */