diff --git a/default.nix b/default.nix
index 9d0e321f97..8f5ccaa002 100644
--- a/default.nix
+++ b/default.nix
@@ -1,49 +1,70 @@
 { }:
-
+# we only this file to release a nix package, use flake.nix for development
 let
-  sources = import nix/sources.nix { };
-  pkgs = import sources.nixpkgs { };
-
+  rev = "f6342b8b9e7a4177c7e775cdbf38e1c1b43e7ab3"; # nixpkgs master
+  nixpkgs = builtins.fetchTarball {
+    url = "https://github.com/nixos/nixpkgs/tarball/${rev}";
+    sha256 = "JTiKsBT1BwMbtSUsvtSl8ffkiirby8FaujJVGV766Q8=";
+  };
+  pkgs = import nixpkgs { };
   rustPlatform = pkgs.rustPlatform;
-  llvmPkgs = pkgs.llvmPackages_12;
+  llvmPkgs = pkgs.llvmPackages_13;
 in
 rustPlatform.buildRustPackage {
   pname = "roc";
-  version = "0.1.0";
+  version = "0.0.1";
 
   src = pkgs.nix-gitignore.gitignoreSource [] ./.;
 
-  cargoSha256 = "11r8drmps92i7l3bg3zabds9n5rim9f4fjsgr86nhqhcsivi80y4";
+  cargoSha256 = "sha256-oSi9UIom3YowgfR1U4c6her3SsfeV//t6Dy3eOQaW9o=";
 
-  LLVM_SYS_120_PREFIX = "${llvmPkgs.llvm.dev}";
+  LLVM_SYS_130_PREFIX = "${llvmPkgs.llvm.dev}";
 
-  # required for zig builds
+  # for cli bindgen "No such file or directory"
+  preBuild = ''
+    # From: https://github.com/NixOS/nixpkgs/blob/1fab95f5190d087e66a3502481e34e15d62090aa/pkgs/applications/networking/browsers/firefox/common.nix#L247-L253
+    # Set C flags for Rust's bindgen program. Unlike ordinary C
+    # compilation, bindgen does not invoke $CC directly. Instead it
+    # uses LLVM's libclang. To make sure all necessary flags are
+    # included we need to look in a few places.
+    export BINDGEN_EXTRA_CLANG_ARGS="$(< ${pkgs.stdenv.cc}/nix-support/libc-crt1-cflags) \
+      $(< ${pkgs.stdenv.cc}/nix-support/libc-cflags) \
+      $(< ${pkgs.stdenv.cc}/nix-support/cc-cflags) \
+      $(< ${pkgs.stdenv.cc}/nix-support/libcxx-cxxflags) \
+      ${pkgs.lib.optionalString pkgs.stdenv.cc.isClang "-idirafter ${pkgs.stdenv.cc.cc}/lib/clang/${pkgs.lib.getVersion pkgs.stdenv.cc.cc}/include"} \
+      ${pkgs.lib.optionalString pkgs.stdenv.cc.isGNU "-isystem ${pkgs.stdenv.cc.cc}/include/c++/${pkgs.lib.getVersion pkgs.stdenv.cc.cc} -isystem ${pkgs.stdenv.cc.cc}/include/c++/${pkgs.lib.getVersion pkgs.stdenv.cc.cc}/${pkgs.stdenv.hostPlatform.config}"}
+    "
+  '';
+
+  # required for zig
   XDG_CACHE_HOME = "/build/xdgcache";
+  # nix does not store libs in /usr/lib or /lib
+  NIX_GLIBC_PATH = if pkgs.stdenv.isLinux then "${pkgs.glibc.out}/lib" else "";
+  # want to see backtrace in case of failure
+  RUST_BACKTRACE = 1;
 
   nativeBuildInputs = (with pkgs; [
     cmake
     git
     pkg-config
     python3
-    llvmPkgs.lld
     llvmPkgs.clang
     llvmPkgs.llvm.dev
-
-    (import ./nix/zig.nix { inherit pkgs; })
+    zig
+    rust-bindgen
   ]);
 
   buildInputs = (with pkgs; [
-    (import ./nix/debugir.nix { inherit pkgs; })
     libffi
     libiconv
     libxkbcommon
     libxml2
     ncurses
     zlib
+    cargo
   ]
   ++ lib.optionals pkgs.stdenv.isLinux [
       alsa-lib
-      glibc_multi
       valgrind
       vulkan-headers
       vulkan-loader
diff --git a/flake.lock b/flake.lock
index 57d6bd72d4..53e33a09ed 100644
--- a/flake.lock
+++ b/flake.lock
@@ -67,16 +67,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1647282937,
-        "narHash": "sha256-K8Oo6QyFCfiEWTRpQVfzcwI3YNMKlz6Tu8rr+o3rzRQ=",
+        "lastModified": 1657972522,
+        "narHash": "sha256-JTiKsBT1BwMbtSUsvtSl8ffkiirby8FaujJVGV766Q8=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "64fc73bd74f04d3e10cb4e70e1c65b92337e76db",
+        "rev": "07a2e6a4e31ea48408861607198972d60adaf4ad",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-21.11",
+        "ref": "nixos-22.05",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 5dc70e4f77..e81551bd2a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Roc flake";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
+    nixpkgs.url =  "github:nixos/nixpkgs/nixos-22.05";
     # rust from nixpkgs has some libc problems, this is patched in the rust-overlay
     rust-overlay = {
       url = "github:oxalica/rust-overlay";
@@ -24,7 +24,7 @@
 
   outputs = { self, nixpkgs, rust-overlay, zig, flake-utils, nixgl }:
     let
-      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" ];
     in
     flake-utils.lib.eachSystem supportedSystems (system:
       let
@@ -120,6 +120,7 @@
           buildInputs = sharedInputs ++ darwinInputs ++ linuxInputs ++  (if system == "x86_64-linux" then [ pkgs.nixgl.nixVulkanIntel ] else []);
 
           LLVM_SYS_130_PREFIX = "${llvmPkgs.llvm.dev}";
+          # nix does not store libs in /usr/lib or /lib
           NIX_GLIBC_PATH = if pkgs.stdenv.isLinux then "${pkgs.glibc.out}/lib" else "";
           LD_LIBRARY_PATH = with pkgs;
             lib.makeLibraryPath