I have now implemented a simple mechanism. There is a variable named PKG_PREFER_OLDER in file PKGS_MANAGEMENT. There are some comments in the file that explain how it works.
The reason that this has become important to implement, is the 188.8.131.52 kernel has Aufs 2.1 and a new aufs2-util package that may not be suitable for the older Aufs 2 kernel driver. So, I have two aufs2-util packages and a simple mechanism to choose the right one.
I will also be applying this to alsa-lib and alsa-utils.
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