Update nix pin with make nixpkgs

Signed-off-by: Wong Hoi Sing Edison <hswong3i@pantarei-design.com>

Makefile

@@ -52,7 +52,7 @@ endif
 # Update nix/nixpkgs.json its latest stable commit
 .PHONY: nixpkgs
 nixpkgs:
-	@nix run -f channel:nixos-20.03 nix-prefetch-git -c nix-prefetch-git \
+	@nix run -f channel:nixos-20.09 nix-prefetch-git -c nix-prefetch-git \
 		--no-deepClone https://github.com/nixos/nixpkgs > nix/nixpkgs.json
 
 # Build statically linked binary

nix/default.nix

@@ -59,10 +59,10 @@ let
     doCheck = false;
     enableParallelBuilding = true;
     outputs = [ "out" ];
-    nativeBuildInputs = [ bash git pcre pkg-config which ];
+    nativeBuildInputs = [ bash gitMinimal pcre pkg-config which ];
     buildInputs = [ glibc glibc.static glib ];
     prePatch = ''
-      export CFLAGS='-static'
+      export CFLAGS='-static -pthread'
       export LDFLAGS='-s -w -static-libgcc -static'
       export EXTRA_LDFLAGS='-s -w -linkmode external -extldflags "-static -lm"'
     '';

nix/nixpkgs.json

@@ -1,7 +1,10 @@
 {
   "url": "https://github.com/nixos/nixpkgs",
-  "rev": "6e089d30148953df7abb3a1167169afc7848499c",
-  "date": "2020-11-05T09:56:30+01:00",
-  "sha256": "0ydqjkz7payl16psx445jwh6dc6lgbvj2w11xin1dqvbpcp03jcy",
-  "fetchSubmodules": false
+  "rev": "6ea2fd15d881006b41ea5bbed0f76bffcd85f9f9",
+  "date": "2020-12-20T13:26:58+10:00",
+  "path": "/nix/store/kyw1ackbp9qh1jzlzwmjvi5i3541ym5z-nixpkgs",
+  "sha256": "0kgqmw4ki10b37530jh912sn49x3gay5cnmfr8yz2yp8nvkrk236",
+  "fetchSubmodules": false,
+  "deepClone": false,
+  "leaveDotGit": false
 }