diff --git a/_service b/_service
index 84c2fd6..9d340dd 100644
--- a/_service
+++ b/_service
@@ -6,7 +6,7 @@
     <param name="exclude">.git</param>
     <param name="filename">suse-hpc</param>
     <param name="versionformat">0.4.%h</param>
-    <param name="revision">ec20e912f5395e091bede4849ecc5476581c1871</param>
+    <param name="revision">d55686f0e90750122e3a56f4a38e3cb05a02381c</param>
 	<param name="extract">general/dlinfo.c</param>
 	<param name="extract">general/macros.hpc</param>
 	<param name="extract">general/hpc_elf.pl</param>
diff --git a/macros.hpc b/macros.hpc
index 5eb4ad3..b3465c8 100644
--- a/macros.hpc
+++ b/macros.hpc
@@ -32,9 +32,12 @@
 %hpc_libexecdir %{hpc_prefix}/lib
 %hpc_localstatedir %{_localstatedir}
 %hpc_sharedstatedir %{_sharedstatedir}
+# MANPATH
 %hpc_mandir %{hpc_datadir}/man
 %hpc_docdir %{hpc_datadir}/doc/packages
+# INFOPATH
 %hpc_infodir %{hpc_datadir}/info
+# PKG_CONFIG_PATH
 %hpc_pkgconfigdir %{hpc_libdir}/pkgconfig
 %hpc_cmake_dir %{hpc_datadir}/cmake
 %hpc_cmake_moddir %{hpc_cmake_dir}/Modules
@@ -369,8 +372,13 @@ cat << EOF > %{buildroot}%{hpc_module_dep_base}%{version}
 # -N  <pname>: Specify if a sub-package has different basename (pname)
 # -q: For internal use only!
 # -M: use specified name in place of %%name
+# -O: Obsoleted package with version %version, multiple obsoletes may be
+#     separated by ":"
+# -E: create an 'empty' master package with no requires. This allows to
+#     keep the macro package around for compatibility even if the underlying
+#     package has been removed.
 #
-%hpc_master_package(n:g:s:lLaqN:M:) \
+%hpc_master_package(n:g:s:lLaqN:M:O:E) \
  %define _mylib %{-s:lib}%{!-s:%{-l:lib}} \
  %define _p_ext %(test -n "%{*}" && echo -%{*}) \
  %{-M: \ %define name %{-M*}} \
@@ -415,7 +423,14 @@ cat << EOF > %{buildroot}%{hpc_module_dep_base}%{version}
 Summary: Dependency package for %{s_name} \
 Group:   %_group \
 Obsoletes: %_lname < %version \
-Requires:  %{s_name} = %version \
+%{-O:%(\
+   v=%{-O*}; \
+   for i in ${v//:/ }; \
+     do echo "Obsoletes: $i < %version"; \
+     echo "Provides: %i = %version"; \
+   done)\
+} \
+%{!-E:Requires:  %{s_name} = %version} \
 %{!-l:%{!-s:%{!-a:BuildArch:      noarch}}} \
 %description -n %_lname \
 %{pname}: %{SUMMARY} \
diff --git a/suse-hpc.changes b/suse-hpc.changes
index 0d992b8..ce1dec7 100644
--- a/suse-hpc.changes
+++ b/suse-hpc.changes
@@ -1,3 +1,11 @@
+-------------------------------------------------------------------
+Mon Apr 27 06:58:20 UTC 2020 - Egbert Eich <eich@suse.com>
+
+- Add 'Obsolete:' option to master package. This way, a removed
+  master package may be declared obsolte. 
+- Allow 'Empty' package - without a 'Requires:' to keep master
+  package for backward compatibility.
+
 -------------------------------------------------------------------
 Wed Feb  6 07:08:30 UTC 2019 - eich@suse.com
 
diff --git a/suse-hpc.spec b/suse-hpc.spec
index 1456b4b..d41cae4 100644
--- a/suse-hpc.spec
+++ b/suse-hpc.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package suse-hpc
 #
-# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2020 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -20,7 +20,7 @@ Summary:        SUSE HPC Environment
 License:        BSD-3-Clause
 Group:          Productivity/Clustering/Computing
 Name:           suse-hpc
-Version:        0.4
+Version:        0.5
 Release:        0
 Source0:        macros.hpc
 Source1:        dlinfo.c
@@ -28,7 +28,7 @@ Source2:        hpc_elf.pl
 Source3:        hpc_elf.attr
 Source4:        hpc_elflib.attr
 Source5:        LICENSE
-Url:            http://www.suse.com/hpc
+URL:            http://www.suse.com/hpc
 
 %description
 Provide rpm macros for building and installing SUSE HPC