4) Change "%define mysql_version 4.0.17" to "%define mysql_version 4.0.20" (Line #1) 5) Change "Version: 4.0.17" to "Version: 4.0.20" (Line #15)
Save yourself work in the future. Change the 2nd line to:
Version: %{mysql_version}
Then you only have to change the macro definition in the future.