@@ -68,6 +68,7 @@ hooks =
6868 , ("github-backup", set (executableDepends . tool . contains (pkg "git")) True)
6969 , ("GLFW", over (libraryDepends . system) (Set.union (Set.fromList [bind "pkgs.xorg.libXext", bind "pkgs.xorg.libXfixes"])))
7070 , ("GlomeVec", set (libraryDepends . pkgconfig . contains (bind "self.llvmPackages.llvm")) True)
71+ , ("graphviz", set (testDepends . system . contains (pkg "graphviz")) True)
7172 , ("gtk3", gtk3Hook)
7273 , ("haddock", haddockHook) -- https://github.com/haskell/haddock/issues/511
7374 , ("hakyll", set (testDepends . tool . contains (pkg "utillinux")) True) -- test suite depends on "rev"