diff --git a/Common/OS.cpp b/Common/OS.cpp
index 9953b60278f7730931aa9df079b296c2b37ec604..ee416492a6f743fb9a9e63b9898f50a25e23aa99 100644
--- a/Common/OS.cpp
+++ b/Common/OS.cpp
@@ -1,4 +1,4 @@
-// $Id: OS.cpp,v 1.1 2006-02-26 16:26:08 geuzaine Exp $
+// $Id: OS.cpp,v 1.2 2006-02-26 16:55:08 geuzaine Exp $
 //
 // Copyright (C) 1997-2006 C. Geuzaine, J.-F. Remacle
 //
@@ -24,6 +24,7 @@
 
 // these are available on all OSes
 #include <stdlib.h>
+#include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <time.h>
@@ -35,6 +36,7 @@
 #else
 #include <windows.h>
 #include <process.h>
+#include <io.h>
 #endif
 
 #if defined(__APPLE__)
diff --git a/Common/OS.h b/Common/OS.h
index dcedc34beaea4c4c3e9a236d2f1eb8efd24d66df..d46a48d9e84dad6d985d04e4beb651b74310a512 100644
--- a/Common/OS.h
+++ b/Common/OS.h
@@ -28,6 +28,6 @@ int GetProcessId();
 int UnlinkFile(char *name);
 int StatFile(char *filename);
 int KillProcess(int pid);
-int SystemCall(char *command);
+void SystemCall(char *command);
 
 #endif