anchor.diff:        runHook postBuild
       '';
   
  -    installPhase = ''
  +    installPhase = if installPhase == null
  +    then ''
         runHook preInstall
         mkdir -p "$out/lib/erlang/lib/${name}-${version}"
         for reldir in src ebin priv include; do
  
positive.code:         success=1
        done
        runHook postInstall
      '';
  
      meta = {
        inherit (erlang.meta) platforms;
  
negative.code: , buildInputs ? [], erlangDeps ? [], pluginDeps ? []
  , postPatch ? ""
  , compilePorts ? false
  , installPhase ? null
  , meta ? {}
  , ... }@attrs:
  
  