Fix nix shell

Author: Anderssorby

flake.nix

@@ -34,6 +34,11 @@
           cabal = "latest";
           hlint = "latest";
           haskell-language-server = "latest";
+
+          # Env
+          GRIN_CC = "${pkgs.clang_7}/bin/clang";
+          GRIN_OPT = "${pkgs.llvm_7}/bin/opt";
+          GRIN_LLC = "${pkgs.llvm_7}/bin/llc";
         };
       };
     }

shell.nix

@@ -1,13 +1,15 @@
 let
+  sources = import ./nix/sources.nix {};
+  nixpkgs = import sources.nixpkgs {};
   pkgs = import ./default.nix;
 in
   pkgs.shellFor {
-    buildInputs = with pkgs.haskellPackages; [
+    buildInputs = with nixpkgs.haskellPackages; [
       hlint
       ghcid
     ];
 
-    GRIN_CC = "${pkgs.clang_7}/bin/clang";
-    GRIN_OPT = "${pkgs.llvm_7}/bin/opt";
-    GRIN_LLC = "${pkgs.llvm_7}/bin/llc";
+    GRIN_CC = "${nixpkgs.clang_7}/bin/clang";
+    GRIN_OPT = "${nixpkgs.llvm_7}/bin/opt";
+    GRIN_LLC = "${nixpkgs.llvm_7}/bin/llc";
   }