cabal doesn't explore the none manual flags very well

[Carter Schonwald]

Hey all,
i'm repeatedly seeing many examples where a Manual : False flag is used to
encode an "OR" in the cabal configuration, and where cabal "gives up" on
finding the "right" build plan i know it can find if it has to flip the
flag in a dependency its building...

Is this a known issue? how can i mitigate it?
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