fixing nix development and build environments

Bindings/Haskell/flake.nix

@@ -11,13 +11,13 @@
       system:
         let
           pkgs = nixpkgs.legacyPackages.${system};
-          hsPkgs = pkgs.haskell.packages.ghc98;
         in
         {
-          packages.default = hsPkgs.callCabal2nix "p2prc" ./. {};
+          packages.default = pkgs.haskellPackages.callPackage ./project.nix {};
 
           devShell = pkgs.mkShell {
             buildInputs = with pkgs; [
+              cabal2nix
               cabal-install
               haskell.compiler.ghc98
               zlib.dev

Bindings/Haskell/project.nix

@@ -0,0 +1,17 @@
+{ mkDerivation, aeson, base, bytestring, directory, lib, process
+, text
+}:
+mkDerivation {
+  pname = "p2prc";
+  version = "0.1.0.0";
+  src = ./.;
+  isLibrary = true;
+  isExecutable = true;
+  libraryHaskellDepends = [
+    aeson base bytestring directory process text
+  ];
+  executableHaskellDepends = [ base ];
+  description = "P2PRC haskell library";
+  license = "unknown";
+  mainProgram = "p2prc";
+}