diff --git a/post-build-checks.changes b/post-build-checks.changes
index 2fb4c6c..1e48d5e 100644
--- a/post-build-checks.changes
+++ b/post-build-checks.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Dec  7 14:58:27 CET 2009 - mmarek@suse.cz
+
+- do not mess with sysconfig files when installed in a live system
+  (no more missed appointments...).
+
 -------------------------------------------------------------------
 Thu Nov  5 15:48:37 CET 2009 - meissner@suse.de
 
diff --git a/post-build-checks.spec b/post-build-checks.spec
index 4a29b04..0d36322 100644
--- a/post-build-checks.spec
+++ b/post-build-checks.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package post-build-checks (Version 1.0)
 #
-# Copyright (c) 2009 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2010 SUSE LINUX Products GmbH, Nuernberg, Germany.
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -19,12 +19,12 @@
 
 
 Name:           post-build-checks
-License:        GPL v2 or later
+License:        GPLv2+
 Group:          Development/Tools/Building
 AutoReqProv:    on
 Summary:        post checks for build after rpms have been created
 Version:        1.0
-Release:        67
+Release:        68
 PreReq:         aaa_base permissions sed
 Source0:        %{name}-%{version}.tar.bz2
 Source1:        suse-buildsystem.sh
@@ -68,6 +68,10 @@ done
 rm -rf $RPM_BUILD_ROOT
 
 %post
+# do nothing when not in a build chroot
+if ! test -e /.buildenv; then
+    exit 0
+fi
 sed -i -e "s@^PERMISSION_SECURITY=.*@PERMISSION_SECURITY=\"secure\"@" /etc/sysconfig/security
 sed -i -e "s@^TIMEZONE=.*@TIMEZONE=\"UTC\"@" /etc/sysconfig/clock
 if test -f /bin/uname -a ! -L /bin/uname ; then
@@ -76,6 +80,9 @@ if test -f /bin/uname -a ! -L /bin/uname ; then
 fi
 
 %preun
+if ! test -e /.buildenv; then
+    exit 0
+fi
 if test "$1" = 0 -a -f /bin/uname.bin ; then
     mv /bin/uname.bin /bin/uname
 fi