diff --git a/tools/cpp/emscripten/emcc.sh b/tools/cpp/emscripten/emcc.sh
new file mode 100755
index 0000000..52ed893
--- /dev/null
+++ b/tools/cpp/emscripten/emcc.sh
@@ -0,0 +1,65 @@
+#!/bin/bash
+# Originally sourced from https://github.com/ribrdb/rules_emscripten
+set -euo pipefail
+EM_CONFIG="LLVM_ROOT='$(pwd -P)/external/emscripten_clang';"
+EM_CONFIG+="EMSCRIPTEN_NATIVE_OPTIMIZER='external/emscripten_clang/optimizer';"
+EM_CONFIG+="BINARYEN_ROOT='external/emscripten_clang/binaryen';"
+EM_CONFIG+="NODE_JS='$(pwd -P)/external/nodejs/bin/node';"
+EM_CONFIG+="EMSCRIPTEN_ROOT='external/emscripten_toolchain';"
+EM_CONFIG+="SPIDERMONKEY_ENGINE='';"
+EM_CONFIG+="V8_ENGINE='';"
+EM_CONFIG+="TEMP_DIR='tmp';"
+EM_CONFIG+="COMPILER_ENGINE=NODE_JS;"
+EM_CONFIG+="JS_ENGINES=[NODE_JS];"
+export EM_CONFIG
+
+export EM_EXCLUSIVE_CACHE_ACCESS=1
+export EMCC_SKIP_SANITY_CHECK=1
+# export EMCC_DEBUG=2
+export EMCC_WASM_BACKEND=0
+export EMMAKEN_NO_SDK=1
+
+mkdir -p "tmp/emscripten_cache"
+export EM_CACHE="$(pwd -P)/tmp/emscripten_cache"
+export EMCC_TEMP_DIR="$(pwd -P)/tmp"
+
+# Prepare the cache content so emscripten doesn't try to rebuild it all the time
+cache_source=tools/cpp/emscripten/emscripten_cache
+if [ -d toolchain/emscripten_cache ]; then
+  cache_source=toolchain/emscripten_cache
+elif [ -d external/rules_emscripten/toolchain/emscripten_cache ]; then
+  cache_source=external/rules_emscripten/toolchain/emscripten_cache
+fi
+(
+  cd tmp/emscripten_cache;
+  for n in "../../$cache_source"/*;do
+    ln -s "$n"
+  done
+)
+
+argv=("$@")
+tarfile=
+# Find the -o option, and strip the .tar from it.
+for (( i=0; i<$#; i++ )); do
+  if [[ "x${argv[i]}" == x-o ]]; then
+    arg=${argv[$((i+1))]}
+    if [[ "x$arg" == x*.tar ]];then
+        tarfile="$(cd $(dirname "$arg"); pwd -P)/$(basename "$arg")"
+        emfile="$(dirname "$arg")/$(basename $arg .tar)"
+        basearg="$(basename "$(basename "$(basename "$emfile" .js)" .html)" .wasm)"
+        baseout="$(dirname "$arg")/$basearg"
+        argv[$((i+1))]="$emfile"
+    fi
+  fi
+done
+python external/emscripten_toolchain/emcc.py "${argv[@]}"
+# Now create the tarfile
+shopt -s extglob
+if [ "x$tarfile" != x ]; then
+  outdir="$(dirname "$baseout")"
+  outbase="$(basename "$baseout")"
+  (
+      cd "$outdir";
+      tar cf "$tarfile" "$outbase."?(html|js|wasm|mem|data|worker.js)
+  )
+fi