[Lazarus] sockets.pp(20, 5) Error: include file not found "osdefs.inc"

[FreeMan]

fpc r30263 lazarus r48429 yosemite qt x64

in
/opt/freepascal/3.1.1/packages/rtl-extra/src/unix/sockets.pp

unit Sockets;
Interface
{$ifdef Unix}
Uses baseunix,UnixType;
{$endif}
{$i osdefs.inc}       { Compile time defines }
....
this file is not in /opt/freepascal/3.1.1/packages/rtl-extra/src/unix/


On 20.03.2015 13:54, Mattias Gaertner wrote:
> On Fri, 20 Mar 2015 13:24:05 +0200
> FreeMan<freeman35 at delphiturkiye.com>  wrote:
>
>> >That's a configuration problem in your lazarus. Please ask for help on
>> >the fora or mailing lists.
>> >Jonas Maebe (manager) wrote this that link.
>> >is this problem from fpc or lazarus?
> What Lazarus version?
>
> Check your FPC source directory and that you use the 3.1.1 compiler.
>
> Check View / IDE Internals / About IDE.
>
>