diff --git a/tdb.changes b/tdb.changes
index 5baafe7..a51f0cc 100644
--- a/tdb.changes
+++ b/tdb.changes
@@ -1,7 +1,7 @@
 -------------------------------------------------------------------
-Wed May 30 16:08:28 UTC 2012 - lmuelle@suse.com
+Wed May 30 16:39:26 UTC 2012 - lmuelle@suse.com
 
-- Define missing python macros on pre-6 CentOS and RHEL systems.
+- Define python_sitearch if undefined.
 
 -------------------------------------------------------------------
 Wed May 30 15:36:34 UTC 2012 - lmuelle@suse.com
diff --git a/tdb.spec b/tdb.spec
index ae55e55..2205c27 100644
--- a/tdb.spec
+++ b/tdb.spec
@@ -17,7 +17,7 @@
 
 # norootforbuild
 
-%if 0%{?centos_version} && 0%{?centos_version} < 600 || 0%{rhel_version} && 0%{rhel_version} < 600
+%if "%{python_sitearch}" == ""
 # CentOS and RHEL pre-6 don't know python_sitearch
 %define python_sitearch %(%{__python} -c "from distutils.sysconfig import get_python_lib; import sys; sys.stdout.write(get_python_lib(1))")
 %endif