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diff --git a/rtl/wasi/sysutils.pp b/rtl/wasi/sysutils.pp
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+{
+    This file is part of the Free Pascal run time library.
+    Copyright (c) 1999-2021 by the Free Pascal development team.
+
+    Sysutils unit for The WebAssembly System Interface (WASI).
+
+    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.
+
+ **********************************************************************}
+
+{$inline on}
+
+unit sysutils;
+interface
+
+{$MODE objfpc}
+{$MODESWITCH out}
+{ force ansistrings }
+{$H+}
+{$modeswitch typehelpers}
+{$modeswitch advancedrecords}
+
+uses
+  wasiapi;
+
+{$DEFINE HAS_SLEEP}
+
+{ used OS file system APIs use ansistring }
+{$define SYSUTILS_HAS_ANSISTR_FILEUTIL_IMPL}
+{ OS has an ansistring/single byte environment variable API }
+{$define SYSUTILS_HAS_ANSISTR_ENVVAR_IMPL}
+
+{ Include platform independent interface part }
+{$i sysutilh.inc}
+
+
+implementation
+
+  uses
+    sysconst;
+
+{$DEFINE FPC_FEXPAND_UNC} (* UNC paths are supported *)
+{$DEFINE FPC_FEXPAND_DRIVES} (* Full paths begin with drive specification *)
+{$DEFINE HAS_LOCALTIMEZONEOFFSET}
+
+{$DEFINE executeprocuni} (* Only 1 byte version of ExecuteProcess is provided by the OS *)
+
+{ Include platform independent implementation part }
+{$i sysutils.inc}
+
+
+{****************************************************************************
+                              File Functions
+****************************************************************************}
+
+
+Function FileOpen (Const FileName : RawByteString; Mode : Integer) : THandle;
+Begin
+end;
+
+
+Function FileCreate (Const FileName : RawByteString) : THandle;
+begin
+end;
+
+
+Function FileCreate (Const FileName : RawByteString; ShareMode:integer; Rights : integer) : THandle;
+begin
+end;
+
+
+Function FileCreate (Const FileName : RawByteString; Rights:integer) : THandle;
+begin
+end;
+
+
+Function FileRead (Handle : THandle; Out Buffer; Count : longint) : Longint;
+begin
+end;
+
+
+Function FileWrite (Handle : THandle; const Buffer; Count : Longint) : Longint;
+begin
+end;
+
+
+Function FileSeek (Handle : THandle; FOffset, Origin : Longint) : Longint;
+begin
+end;
+
+
+Function FileSeek (Handle : THandle; FOffset: Int64; Origin: {Integer}Longint) : Int64;
+begin
+end;
+
+
+Procedure FileClose (Handle : THandle);
+begin
+end;
+
+
+Function FileTruncate (Handle: THandle; Size: Int64) : boolean;
+begin
+end;
+
+
+Function FileAge (Const FileName : RawByteString): Int64;
+begin
+end;
+
+
+function FileGetSymLinkTarget(const FileName: RawByteString; out SymLinkRec: TRawbyteSymLinkRec): Boolean;
+begin
+  Result := False;
+end;
+
+
+function FileExists (const FileName: RawByteString; FollowLink : Boolean): boolean;
+begin
+end;
+
+
+Function DirectoryExists (Const Directory : RawByteString; FollowLink : Boolean) : Boolean;
+begin
+end;
+
+
+Function InternalFindFirst (Const Path : RawByteString; Attr : Longint; out Rslt : TAbstractSearchRec; var Name: RawByteString) : Longint;
+begin
+end;
+
+
+Function InternalFindNext (var Rslt : TAbstractSearchRec; var Name : RawByteString) : Longint;
+begin
+end;
+
+
+Procedure InternalFindClose(var Handle: THandle);
+begin
+end;
+
+
+Function FileGetDate (Handle : THandle) : Int64;
+begin
+end;
+
+
+Function FileSetDate (Handle : THandle; Age : Int64) : Longint;
+begin
+end;
+
+
+Function FileGetAttr (Const FileName : RawByteString) : Longint;
+begin
+end;
+
+
+Function FileSetAttr (Const Filename : RawByteString; Attr: longint) : Longint;
+begin
+end;
+
+
+Function DeleteFile (Const FileName : RawByteString) : Boolean;
+begin
+end;
+
+
+Function RenameFile (Const OldName, NewName : RawByteString) : Boolean;
+begin
+end;
+
+
+{****************************************************************************
+                              Disk Functions
+****************************************************************************}
+
+
+function diskfree(drive : byte) : int64;
+begin
+end;
+
+
+function disksize(drive : byte) : int64;
+begin
+end;
+
+
+{****************************************************************************
+                              Time Functions
+****************************************************************************}
+
+{$I tzenv.inc}
+
+Procedure GetLocalTime(var SystemTime: TSystemTime);
+begin
+end ;
+
+
+{****************************************************************************
+                              Misc Functions
+****************************************************************************}
+
+procedure sysBeep;
+begin
+end;
+
+
+{****************************************************************************
+                              Locale Functions
+****************************************************************************}
+
+
+procedure InitAnsi;
+begin
+end;
+
+
+Procedure InitInternational;
+begin
+  InitInternationalGeneric;
+  InitAnsi;
+end;
+
+function SysErrorMessage(ErrorCode: Integer): String;
+
+begin
+  Result:=Format(SUnknownErrorCode,[ErrorCode]);
+end;
+
+{****************************************************************************
+                              Os utils
+****************************************************************************}
+
+Function GetEnvironmentVariable(Const EnvVar : String) : String;
+begin
+end;
+
+Function GetEnvironmentVariableCount : Integer;
+begin
+end;
+
+Function GetEnvironmentString(Index : Integer) : {$ifdef FPC_RTL_UNICODE}UnicodeString{$else}AnsiString{$endif};
+begin
+end;
+
+
+function ExecuteProcess(Const Path: RawByteString; Const ComLine: RawByteString;Flags:TExecuteFlags=[]):integer;
+begin
+end;
+
+
+function ExecuteProcess (const Path: RawByteString;
+                                  const ComLine: array of RawByteString;Flags:TExecuteFlags=[]): integer;
+begin
+end;
+
+
+{*************************************************************************
+                                   Sleep
+*************************************************************************}
+
+procedure Sleep (MilliSeconds: Cardinal);
+begin
+end;
+
+{****************************************************************************
+                              Initialization code
+****************************************************************************}
+
+Initialization
+  InitExceptions;       { Initialize exceptions. OS independent }
+  InitInternational;    { Initialize internationalization settings }
+  OnBeep:=@SysBeep;
+  InitTZ;
+Finalization
+  FreeTerminateProcs;
+  DoneExceptions;
+end.