anchor.diff:      addReflexTraceEventsFlag = if enableTraceReflexEvents
         then drv: appendConfigureFlag drv "-fdebug-trace-events"
         else drv: drv;
  -    addReflexOptimizerFlag = if useReflexOptimizer
  -      then drv: appendConfigureFlag drv "-fuse-reflex-optimizer"
  -      else drv: drv;
       addExposeAllUnfoldingsFlag = if enableExposeAllUnfoldings
         then drv: appendConfigureFlag drv "-fexpose-all-unfoldings"
         else drv: drv;
  
positive.code:         let reflexDom = import ./reflex-dom self;
              jsaddlePkgs = import ./jsaddle self;
              ghcjsDom = import ./ghcjs-dom self;
          in {
          ########################################################################
          # Reflex packages
  
negative.code:           '';
          });
          # https://github.com/ygale/timezone-series/pull/1
          timezone-series = doJailbreak (self.callPackage (cabal2nixResult sources.timezone-series) {});
          constraints = overrideCabal super.constraints (drv: {
            version = "0.9";
            sha256 = "17fjr30ig7v1g7w3bkhn1rnhdfqvq9y2g0xx3clqvlfdx9f17d5p";
          });
          aeson-compat = doJailbreak super.aeson-compat;
  
          # Jailbreaks
          ref-tf = doJailbreak super.ref-tf;
  