From 8aaa3b7c120b62f49f498e36f1dbf25077d1fa52 Mon Sep 17 00:00:00 2001
From: Emile Clark-Boman <eclarkboman@gmail.com>
Date: Tue, 22 Jul 2025 03:44:20 +1000
Subject: [PATCH] Fixed emscripten breaks on NixOS due to lack of FHS

---
 flake.nix | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/flake.nix b/flake.nix
index f0a860a..40171f2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -16,6 +16,15 @@
       };
     in
       pkgs.mkShell {
+        # Ref: https://github.com/NixOS/nixpkgs/issues/139943
+        # EM_CONFIG = pkgs.writeText ".emscripten" ''
+        #   EMSCRIPTEN_ROOT = '${pkgs.emscripten}/share/emscripten'
+        #   LLVM_ROOT = '${pkgs.emscripten.llvmEnv}/bin'
+        #   BINARYEN_ROOT = '${pkgs.binaryen}'
+        #   NODE_JS = '${pkgs.nodejs_24}/bin/node'
+        #   CACHE = '${toString ./.cache}'
+        # '';
+
         packages = with pkgs; [
           openssl
           gnumake
@@ -25,6 +34,10 @@
         shell = "${pkgs.bash}/bin/bash";
 
         shellHook = ''
+          export EM_CACHE=$PWD/.emscripten_cache
+          cp -r ${pkgs.emscripten}/share/emscripten/cache $EM_CACHE
+          chmod u+rwX -R $EM_CACHE
+
           function makejs { make -f Makefile.js $@; }
         '';
       };