diff --git a/rtl/unix/sysutils.pp b/rtl/unix/sysutils.pp
index 8abab0fd31..4d68fe9f77 100644
--- a/rtl/unix/sysutils.pp
+++ b/rtl/unix/sysutils.pp
@@ -36,12 +36,50 @@ uses
 
 Procedure AddDisk(const path:string);
 
+{ the following is Kylix compatibility stuff, it should be moved to a
+  special compatibilty unit (FK) }
+  const
+    RTL_SIGINT     = 0;
+    RTL_SIGFPE     = 1;
+    RTL_SIGSEGV    = 2;
+    RTL_SIGILL     = 3;
+    RTL_SIGBUS     = 4;
+    RTL_SIGQUIT    = 5;
+    RTL_SIGLAST    = RTL_SIGQUIT;
+    RTL_SIGDEFAULT = -1;
+
+  type
+    TSignalState = (ssNotHooked, ssHooked, ssOverridden);
+
+function InquireSignal(RtlSigNum: Integer): TSignalState;
+procedure AbandonSignalHandler(RtlSigNum: Integer);
+procedure HookSignal(RtlSigNum: Integer);
+procedure UnhookSignal(RtlSigNum: Integer; OnlyIfHooked: Boolean = True);
 
 implementation
 
 Uses
   {$ifdef FPC_USE_LIBC}initc{$ELSE}Syscall{$ENDIF}, Baseunix, unixutil;
 
+function InquireSignal(RtlSigNum: Integer): TSignalState;
+  begin
+  end;
+
+
+procedure AbandonSignalHandler(RtlSigNum: Integer);
+  begin
+  end;
+
+
+procedure HookSignal(RtlSigNum: Integer);
+  begin
+  end;
+
+
+procedure UnhookSignal(RtlSigNum: Integer; OnlyIfHooked: Boolean = True);
+  begin
+  end;
+
 {$Define OS_FILEISREADONLY} // Specific implementation for Unix.
 
 Function getenv(name:shortstring):Pchar; external name 'FPC_SYSC_FPGETENV';