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+`keysafe` and `zxcvbn-c` (and possibly others) fail to build with Cabal 2.0. Cabal now requires a top-level `custom-setup` and inner `setup-depends` stanza for packages with build-type `Custom`. This field specifies the dependencies of `Setup.hs` itself.
+
+For example:
+
+    custom-setup:
+      setup-depends:
+        base,
+        Cabal
+
+See https://github.com/haskell/cabal/issues/5278 for someone complaining about the horrible error message Cabal spits out in this situation.