diff --git a/OpenSceneGraph.spec b/OpenSceneGraph.spec
index 49c26a5..9ae448b 100644
--- a/OpenSceneGraph.spec
+++ b/OpenSceneGraph.spec
@@ -9,6 +9,9 @@
 
 %define _with_pkgconfig 0
 
+# The lastest rpm "version-release" of OSG1's Producer in Fedora.
+%define OSG1_Producer 1.2-4%{?dist}
+
 Name:           OpenSceneGraph
 Version:        %{srcvers}
 Release:        3%{?dist}
@@ -40,7 +43,7 @@ BuildRequires:  cmake
 BuildRequires:  wxGTK-devel
 # HACK: Upstream abandoned Producer, but yum doesn't want to remove packages.
 # Required to let yum remove Producer (from OSG-1)
-Obsoletes:	Producer <= 1.2-2%{?dist}
+Obsoletes:	Producer <= %{OSG1_Producer}
 
 %description
 The OpenSceneGraph is an OpenSource, cross platform graphics toolkit for the 
@@ -109,7 +112,7 @@ Requires:       %name = %{version}-%{release}
 Requires:	pkgconfig
 %endif
 Requires:	OpenThreads-devel
-Obsoletes:	Producer-devel <= 1.2-2%{?dist}
+Obsoletes:	Producer-devel <= %{OSG1_Producer}
 
 %description devel
 Development files for OpenSceneGraph.
@@ -279,6 +282,10 @@ Development files for OpenThreads.
 
 
 %changelog
+* Sat Jun 30 2007 Ralf Corsépius <rc040203@freenet.de> - 2.0-4
+- Cleanup CVS.
+- Add OSG1_Producer define.
+
 * Fri Jun 29 2007 Ralf Corsépius <rc040203@freenet.de> - 2.0-3
 - Re-add (but don't ship) *.pc.
 - Let OpenSceneGraph "Obsolete: Producer".