diff --git a/pkgsel/Base/Kernel.linux.choice b/pkgsel/Base/Kernel.linux.choice
index c875028..87f1ffc 100644
--- a/pkgsel/Base/Kernel.linux.choice
+++ b/pkgsel/Base/Kernel.linux.choice
@@ -2,6 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 # 
 # Filename: target/mnemosyne/pkgsel/Base/Kernel.linux.choice
+# Copyright (C) 2006 The OpenSDE Project
 # Copyright (C) 2002 - 2006 Alejandro Mery
 # 
 # More information can be found in the files COPYING and README.
@@ -15,3 +16,5 @@
 #Description: Linux Kernel (2.6)
 
 X linux-header
+# we need unifdef to install linux-header since 2.6.18
+X unifdef