use nix build & meson & zlog

src/flake.nix

@@ -0,0 +1,38 @@
+{
+  description = "Flake for NEXA xce";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    xbuild.url  = "github:shen390s/my-nix-channel?ref=master";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, xbuild, flake-utils }: 
+    let
+      supportedSystems = [ "x86_64-linux" ];
+      myCommitId =
+        if builtins.hasAttr "shortRev" self
+        then self.shortRev
+        else self.dirtyShortRev;
+    in
+      flake-utils.lib.eachSystem supportedSystems (
+        system: let
+          mypkgs = xbuild.packages.${system};
+          overlays = [
+            (final: prev: prev // mypkgs)
+          ];
+          pkgs = import nixpkgs { inherit overlays system;};
+          xpkgs = import ./default.nix {
+            inherit pkgs myCommitId;
+          };
+        in rec {
+          packages = pkgs // xpkgs;
+          defaultPackage = xpkgs.xce_withoutdb_debug;
+          devShells.default = pkgs.mkShell {
+            nativeBuildInputs = xpkgs.xce.nativeBuildInputs;
+          };
+
+          devShell = self.devShells.${system}.default;
+        }
+      );
+}