diff --git a/mesa-libGLw.spec b/mesa-libGLw.spec
index 7ae8c4c..83ded3a 100644
--- a/mesa-libGLw.spec
+++ b/mesa-libGLw.spec
@@ -19,14 +19,14 @@ BuildRequires: lesstif-devel
 
 Provides: libGLw
 # libGLw used to be in Mesa package in RHL 6.x, 7.[0-2], RHEL 2.1
-Obsoletes: Mesa
+Obsoletes: Mesa <= 3.4.2-10
 # libGLw moved to XFree86-libs for RHL 7.3, 8, 9, FC1, RHEL 3
-Obsoletes: XFree86-libs
+Obsoletes: XFree86-libs < 4.3.0-127
 # libGLw moved to xorg-x11-libs FC[2-4], RHEL4
-Obsoletes: xorg-x11-libs
+Obsoletes: xorg-x11-libs < 6.8.2-38
 
 %description
-Mesa libGLw runtime library
+Mesa libGLw runtime library.
 
 %package devel
 Summary: Mesa libGLw development package
@@ -37,7 +37,7 @@ Requires: lesstif-devel
 Provides: libGLw-devel
 
 %description devel
-Mesa libGLw development package
+Mesa libGLw development package.
 
 #-- prep -------------------------------------------------------------
 %prep