fixing nix development and build environments

flake.lock

@@ -71,12 +71,14 @@
     },
     "p2prc-hs": {
       "inputs": {
-        "nixpkgs": "nixpkgs_2",
-        "utils": "utils"
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": "nixpkgs_2"
       },
       "locked": {
         "lastModified": 1,
-        "narHash": "sha256-185ddVKbQVvVaJL6H8BPxDcH9m+Pmx42eRVJkB0foQM=",
+        "narHash": "sha256-6V4bXwaigsd4mcWfyAzYJ2Cuhj8RDuD/N/Y8d2Z8XZM=",
         "path": "./Bindings/Haskell",
         "type": "path"
       },
@@ -107,39 +109,6 @@
         "repo": "default",
         "type": "github"
       }
-    },
-    "systems_2": {
-      "locked": {
-        "lastModified": 1681028828,
-        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
-        "owner": "nix-systems",
-        "repo": "default",
-        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "nix-systems",
-        "repo": "default",
-        "type": "github"
-      }
-    },
-    "utils": {
-      "inputs": {
-        "systems": "systems_2"
-      },
-      "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
     }
   },
   "root": "root",