diff --git a/tk.changes b/tk.changes
index f267620..7e983e4 100644
--- a/tk.changes
+++ b/tk.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Jan  7 12:34:56 CET 2009 - olh@suse.de
+
+- obsolete old -XXbit packages (bnc#437293)
+
 -------------------------------------------------------------------
 Mon Dec  8 17:13:38 CET 2008 - max@suse.de
 
diff --git a/tk.spec b/tk.spec
index eb25966..34796aa 100644
--- a/tk.spec
+++ b/tk.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package tk (Version 8.5.5)
 #
-# Copyright (c) 2008 SUSE LINUX Products GmbH, Nuernberg, Germany.
+# Copyright (c) 2009 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
@@ -22,12 +22,17 @@ Name:           tk
 BuildRequires:  tcl-devel xorg-x11-devel
 Url:            http://www.tcl.tk
 Version:        8.5.5
-Release:        2
+Release:        3
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 Summary:        Graphical User Interface Toolkit for Tcl
 License:        BSD 3-Clause
 Group:          Development/Languages/Tcl
 AutoReqProv:    on
+# bug437293
+%ifarch ppc64
+Obsoletes:      tk-64bit
+%endif
+#
 Summary:        Graphical User Interface Toolkit for Tcl
 Provides:       wish wish8.4
 Requires:       tcl >= %version
@@ -57,6 +62,11 @@ Summary:        Header Files and C API Documentation for Tk
 Requires:       tk = %version
 Requires:       tcl-devel
 Requires:       xorg-x11-libX11-devel
+# bug437293
+%ifarch ppc64
+Obsoletes:      tk-devel-64bit
+%endif
+#
 
 %description devel
 This package contains header files and documentation needed for writing
@@ -130,6 +140,8 @@ exit 0
 %_libdir/tkConfig.sh
 
 %changelog
+* Wed Jan 07 2009 olh@suse.de
+- obsolete old -XXbit packages (bnc#437293)
 * Mon Dec 08 2008 max@suse.de
 - Added an explicit requirement for xorg-x11-libX11-devel, because
   tk.h needs some of the header files.