anchor.diff:          else if lib.isList v then lib.concatMap collect v
           else [];
         packages = {
  -        tryReflexShell = reflex-platform.tryReflexShell;
  +        # TODO fix GHCJS profiling builds
  +        # tryReflexShell = reflex-platform.tryReflexShell;
           ghc.ReflexTodomvc = reflex-platform.ghc.reflex-todomvc;
           ghc8_6.reflexTodomvc = reflex-platform.ghc8_6.reflex-todomvc;
           skeleton-test-ghc = skeleton-test.ghc;
  
positive.code:         inherit (reflex-platform) iosReflexTodomvc-8_6;
          skeleton-test-project-ios = skeleton-test.project.ios;
        } // drvListToAttrs otherDeps
          // drvListToAttrs (lib.filter lib.isDerivation reflex-platform.cachePackages)
        ;
      in packages // {
        cache = reflex-platform.pinBuildInputs "reflex-platform-${system}-${variant}"
          (collect packages ++ reflex-platform.cachePackages ++ otherDeps);
      });
    in perOptDebugVariant // {
      inherit dep;
      ghcjs.reflexTodomvc = jsexeHydra reflex-platform.ghcjs.reflex-todomvc;
      # Doesn't currently build. Removing from CI until fixed.
      ghcjs8_6.reflexTodomvc = jsexeHydra reflex-platform.ghcjs8_6.reflex-todomvc;
      skeleton-test-ghcjs = skeleton-test.ghcjs;
      nojsstring = {
        ghcjs.reflexTodomvc = reflex-platform-nojsstring.ghcjs.reflex-todomvc;
  
negative.code:     inherit benchmark demoVM;
      cache = reflex-platform.pinBuildInputs "reflex-platform-${system}"
        (builtins.attrValues dep ++ map (a: a.cache) (builtins.attrValues perOptDebugVariant));
    } # TODO  move back to `perOptDebugVariant`
      // drvListToAttrs (lib.filter lib.isDerivation reflex-platform.cachePackages)
    );
  
    metaCache = local-self.pinBuildInputs "reflex-platform-everywhere"
      (map (a: a.cache) (builtins.attrValues perPlatform));
  