Fix compilation on Nix

Author: xdevs23

shell.nix

@@ -1,12 +1,15 @@
-{ pkgs ? import <nixpkgs> {} }:
+{ pkgs ? import <nixpkgs> {}, lib ? pkgs.lib }:
 
-let fhs = pkgs.buildFHSEnv {
+let fhs = let
+  llvm = pkgs.llvmPackages_20;
+  stdenv = pkgs.overrideCC llvm.stdenv (llvm.stdenv.cc.override { inherit (llvm) bintools; });
+  in pkgs.buildFHSEnv {
   name = "linux-env";
   targetPkgs = pkgs: with pkgs; [
       bc
       bison
       ccache
-      llvmPackages_20.clang-unwrapped
+      llvmPackages_20.clang
       elfutils elfutils.dev
       flex
       git
@@ -21,12 +24,16 @@ let fhs = pkgs.buildFHSEnv {
       pkgconf
       python3
       util-linux
+      stdenv
   ];
   multiPkgs = pkgs: with pkgs; [
   ];
   runScript = "zsh";
   profile = ''
     export LD_LIBRARY_PATH=/usr/lib:/usr/lib32
+    export LLVM=1
+    export LD=${llvm.lld}/bin/ld.lld
+    export CC=${lib.getExe llvm.clang-unwrapped}
   '';
 };
 in pkgs.stdenv.mkDerivation {