pin nixpkgs

Author: chris-martin

clock-gtk3/default.nix

@@ -1,5 +1,6 @@
 rec {
-    pkgs = import <nixpkgs> {};
+    pkgs =
+        import (import ./nixpkgs.nix) {};
 
     ghc =
         pkgs.haskell.packages.ghc844.override {
@@ -33,6 +34,7 @@ rec {
             p.unix
         ]);
 
-    ghcid = pkgs.haskellPackages.ghcid;
+    ghcid =
+        pkgs.haskellPackages.ghcid;
 
 }

clock-gtk3/nixpkgs.nix

@@ -0,0 +1,11 @@
+# nix-prefetch-url --unpack https://github.com/NixOS/nixpkgs/archive/<rev>.tar.gz
+
+(import <nixpkgs> { }).fetchFromGitHub {
+  owner = "NixOS";
+  repo = "nixpkgs";
+
+  # NixOS unstable, 2018 Nov 17
+  rev = "80738ed9dc0ce48d7796baed5364eef8072c794d";
+  sha256 = "0anmvr6b47gbbyl9v2fn86mfkcwgpbd5lf0yf3drgm8pbv57c1dc";
+
+}