diff --git a/rtl/linux/ctypes.inc b/rtl/linux/ctypes.inc
new file mode 100644
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+++ b/rtl/linux/ctypes.inc
@@ -0,0 +1,68 @@
+{
+    $Id$
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 2001 by Free Pascal development team
+
+    Basic types for C interfacing. Check the 64-bit defines.    
+
+    See the file COPYING.FPC, included in this distribution,
+    for details about the copyright.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+ **********************************************************************}
+
+{***********************************************************************}
+{                       POSIX TYPE DEFINITIONS                          }
+{***********************************************************************}
+
+{ Introduced defines
+    - 64bitarch (for 64-bits Linux systems, test system was idefix
+}
+
+Type
+    { the following type definitions are compiler dependant }
+    { and system dependant                                  }
+
+    cint8  = shortint;
+    cuint8 = byte;
+    cuint16= word;
+    cint16 = smallint;
+    cint32 = longint;
+    cuint32= cardinal;
+    cint64 = int64;
+{$ifndef VER_1_0}
+    cuint64= qword;
+{$else}
+    cuint64= int64;
+{$endif}
+
+    cuchar = byte;
+    cint   = longint;           { minimum range is : 32-bit    }
+    cuint  = Cardinal;          { minimum range is : 32-bit    }
+  {$ifdef 64bitarch}
+    clong  = int64;
+  {$ifdef VER_1_0}
+    culong = int64;
+  {$else}
+    culong = qword;
+   {$endif}
+  {$else}
+    clong  = longint;
+    culong = Cardinal;
+  {$endif}
+    cshort = integer;
+    cushort= word;
+
+    pcint  = ^cint;
+
+{ 
+   $Log$
+   Revision 1.1  2002-11-09 22:39:28  marco
+    * first version
+
+
+}
+