[sugar] specifying what services Activities may use

[Benjamin M. Schwartz]

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Jerry Williams wrote:
| Seems like this problem for linux was solved with RPM.
| With rpm if something is missing for something you want to install, it
| complains and won't let you install it.

That's not really the problem we're discussing.  We're talking about the
case in which you try to install an old bundle onto a new build, or vice
versa.  RPM solves this problem by just not letting you do that.  You
can't install a rh9 RPM on FC8.

I don't think many people around here would be happy to require all new
.xo bundles for every release.  I don't have a solution to suggest, but I
don't think classic dependency management is going to do the trick.

- --Ben
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