diff --git a/flake.nix b/flake.nix
index 2e923844..8a3a6422 100644
--- a/flake.nix
+++ b/flake.nix
@@ -5,9 +5,9 @@
 
   outputs = { self, nixpkgs }:
     let
-      pkgs = import nixpkgs { system = "x86_64-linux"; };
+      pkgs = import nixpkgs { system = "aarch64-darwin"; };
     in rec {
-      packages.x86_64-linux = rec {
+      packages.aarch64-darwin = rec {
         llvm-nac3 = pkgs.callPackage ./nix/llvm {};
         nac3artiq = pkgs.python3Packages.toPythonModule (
           pkgs.rustPlatform.buildRustPackage rec {
@@ -142,25 +142,26 @@
 
       packages.x86_64-w64-mingw32 = import ./nix/windows { inherit pkgs; };
 
-      devShell.x86_64-linux = pkgs.mkShell {
+      devShell.aarch64-darwin = pkgs.mkShell {
         name = "nac3-dev-shell";
         buildInputs = with pkgs; [
           # build dependencies
-          packages.x86_64-linux.llvm-nac3
+          packages.aarch64-darwin.llvm-nac3
           llvmPackages_13.clang-unwrapped  # IRRT
           pkgs.llvmPackages_13.llvm.out    # IRRT
+          libiconv
           cargo
           rustc
           # runtime dependencies
           lld_13
-          (packages.x86_64-linux.python3-mimalloc.withPackages(ps: [ ps.numpy ]))
+          (packages.aarch64-darwin.python3-mimalloc.withPackages(ps: [ ps.numpy ]))
           # development tools
           cargo-insta
           clippy
           rustfmt
         ];
       };
-      devShells.x86_64-linux.msys2 = pkgs.mkShell {
+      devShells.aarch64-darwin.msys2 = pkgs.mkShell {
         name = "nac3-dev-shell-msys2";
         buildInputs = with pkgs; [
           curl
@@ -171,7 +172,7 @@
       };
 
       hydraJobs = {
-        inherit (packages.x86_64-linux) llvm-nac3 nac3artiq nac3artiq-pgo;
+        inherit (packages.aarch64-darwin) llvm-nac3 nac3artiq nac3artiq-pgo;
         llvm-nac3-msys2 = packages.x86_64-w64-mingw32.llvm-nac3;
         nac3artiq-msys2 = packages.x86_64-w64-mingw32.nac3artiq;
         nac3artiq-msys2-pkg = packages.x86_64-w64-mingw32.nac3artiq-pkg;
diff --git a/nac3artiq/Cargo.toml b/nac3artiq/Cargo.toml
index d4bd8095..b29da307 100644
--- a/nac3artiq/Cargo.toml
+++ b/nac3artiq/Cargo.toml
@@ -19,7 +19,7 @@ nac3core = { path = "../nac3core" }
 git = "https://github.com/nbaksalyar/inkwell.git"
 branch = "llvm14"
 default-features = false
-features = ["llvm14-0", "target-x86", "target-arm", "target-riscv", "no-libffi-linking"]
+features = ["llvm14-0", "target-aarch64", "target-arm", "target-riscv", "no-libffi-linking"]
 
 [features]
 init-llvm-profile = []
diff --git a/nac3core/Cargo.toml b/nac3core/Cargo.toml
index 17264dea..efc6815f 100644
--- a/nac3core/Cargo.toml
+++ b/nac3core/Cargo.toml
@@ -15,7 +15,7 @@ nac3parser = { path = "../nac3parser" }
 git = "https://github.com/nbaksalyar/inkwell.git"
 branch = "llvm14"
 default-features = false
-features = ["llvm14-0", "target-x86", "target-arm", "target-riscv", "no-libffi-linking"]
+features = ["llvm14-0", "target-aarch64", "target-arm", "target-riscv", "no-libffi-linking"]
 
 [dev-dependencies]
 test-case = "1.2.0"
diff --git a/nac3core/src/codegen/irrt/irrt.c b/nac3core/src/codegen/irrt/irrt.c
index ba250dc9..6e18eea8 100644
--- a/nac3core/src/codegen/irrt/irrt.c
+++ b/nac3core/src/codegen/irrt/irrt.c
@@ -1,9 +1,4 @@
-typedef _ExtInt(8) int8_t;
-typedef unsigned _ExtInt(8) uint8_t;
-typedef _ExtInt(32) int32_t;
-typedef unsigned _ExtInt(32) uint32_t;
-typedef _ExtInt(64) int64_t;
-typedef unsigned _ExtInt(64) uint64_t;
+#include "stdint.h"
 
 # define MAX(a, b) (a > b ? a : b)
 # define MIN(a, b) (a > b ? b : a)
diff --git a/nac3standalone/Cargo.toml b/nac3standalone/Cargo.toml
index d3943ecb..aea8c6dd 100644
--- a/nac3standalone/Cargo.toml
+++ b/nac3standalone/Cargo.toml
@@ -13,4 +13,4 @@ nac3core = { path = "../nac3core" }
 git = "https://github.com/nbaksalyar/inkwell.git"
 branch = "llvm14"
 default-features = false
-features = ["llvm14-0", "target-x86", "target-arm", "target-riscv", "no-libffi-linking"]
+features = ["llvm14-0", "target-aarch64", "target-arm", "target-riscv", "no-libffi-linking"]
diff --git a/nix/llvm/default.nix b/nix/llvm/default.nix
index ef1a2971..a632357e 100644
--- a/nix/llvm/default.nix
+++ b/nix/llvm/default.nix
@@ -115,7 +115,7 @@ in stdenv.mkDerivation (rec {
     "-DLLVM_ENABLE_THREADS=OFF"
     "-DLLVM_INCLUDE_BENCHMARKS=OFF"
     "-DLLVM_BUILD_TOOLS=OFF"
-    "-DLLVM_TARGETS_TO_BUILD=X86;ARM;RISCV"
+    "-DLLVM_TARGETS_TO_BUILD=host;ARM;RISCV"
   ] ++ optionals enableSharedLibraries [
     "-DLLVM_LINK_LLVM_DYLIB=ON"
   ] ++ optionals enableManpages [