evolution-sharp only has support for evo-2.6/eds-1.6. The new development version of evolution (currently in overlay) is evo-2.8/eds-1.8. Here is a patch to make evolution-sharp build against development evolution.
Created attachment 86561 [details, diff] Build patch Note that I didn't rev the evolution-api.raw file, because (as nearly as I can tell) the api has not yet changed.
applied upstream, thanks