diff --git a/packages/variant-quickjs-browser-debug-asyncify-singlefile/Makefile b/packages/variant-quickjs-browser-debug-asyncify-singlefile/Makefile
index b334e1d9..99e75c23 100644
--- a/packages/variant-quickjs-browser-debug-asyncify-singlefile/Makefile
+++ b/packages/variant-quickjs-browser-debug-asyncify-singlefile/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-debug-asyncify-wasm/Makefile b/packages/variant-quickjs-browser-debug-asyncify-wasm/Makefile
index f65a2460..f67d6e71 100644
--- a/packages/variant-quickjs-browser-debug-asyncify-wasm/Makefile
+++ b/packages/variant-quickjs-browser-debug-asyncify-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-debug-sync-singlefile/Makefile b/packages/variant-quickjs-browser-debug-sync-singlefile/Makefile
index d0733f20..94def72a 100644
--- a/packages/variant-quickjs-browser-debug-sync-singlefile/Makefile
+++ b/packages/variant-quickjs-browser-debug-sync-singlefile/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-debug-sync-wasm/Makefile b/packages/variant-quickjs-browser-debug-sync-wasm/Makefile
index f1eb5a0e..4180be39 100644
--- a/packages/variant-quickjs-browser-debug-sync-wasm/Makefile
+++ b/packages/variant-quickjs-browser-debug-sync-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-release-asyncify-singlefile/Makefile b/packages/variant-quickjs-browser-release-asyncify-singlefile/Makefile
index 8b24a28f..2a78a854 100644
--- a/packages/variant-quickjs-browser-release-asyncify-singlefile/Makefile
+++ b/packages/variant-quickjs-browser-release-asyncify-singlefile/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-release-asyncify-wasm/Makefile b/packages/variant-quickjs-browser-release-asyncify-wasm/Makefile
index 57700bb7..4ceb0385 100644
--- a/packages/variant-quickjs-browser-release-asyncify-wasm/Makefile
+++ b/packages/variant-quickjs-browser-release-asyncify-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-release-sync-singlefile/Makefile b/packages/variant-quickjs-browser-release-sync-singlefile/Makefile
index 4a0acc92..d55cc2bd 100644
--- a/packages/variant-quickjs-browser-release-sync-singlefile/Makefile
+++ b/packages/variant-quickjs-browser-release-sync-singlefile/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-browser-release-sync-wasm/Makefile b/packages/variant-quickjs-browser-release-sync-wasm/Makefile
index 2e077650..d7b1cf5d 100644
--- a/packages/variant-quickjs-browser-release-sync-wasm/Makefile
+++ b/packages/variant-quickjs-browser-release-sync-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-cjs-debug-asyncify-wasm/Makefile b/packages/variant-quickjs-node-cjs-debug-asyncify-wasm/Makefile
index f6052326..22d6a64e 100644
--- a/packages/variant-quickjs-node-cjs-debug-asyncify-wasm/Makefile
+++ b/packages/variant-quickjs-node-cjs-debug-asyncify-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-cjs-debug-sync-wasm/Makefile b/packages/variant-quickjs-node-cjs-debug-sync-wasm/Makefile
index 4b04208e..dc617928 100644
--- a/packages/variant-quickjs-node-cjs-debug-sync-wasm/Makefile
+++ b/packages/variant-quickjs-node-cjs-debug-sync-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-cjs-release-asyncify-wasm/Makefile b/packages/variant-quickjs-node-cjs-release-asyncify-wasm/Makefile
index defc6f05..88c117b1 100644
--- a/packages/variant-quickjs-node-cjs-release-asyncify-wasm/Makefile
+++ b/packages/variant-quickjs-node-cjs-release-asyncify-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-cjs-release-sync-wasm/Makefile b/packages/variant-quickjs-node-cjs-release-sync-wasm/Makefile
index cecb56b0..1cea5135 100644
--- a/packages/variant-quickjs-node-cjs-release-sync-wasm/Makefile
+++ b/packages/variant-quickjs-node-cjs-release-sync-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-esm-debug-asyncify-wasm/Makefile b/packages/variant-quickjs-node-esm-debug-asyncify-wasm/Makefile
index 1e3c62b7..498810a9 100644
--- a/packages/variant-quickjs-node-esm-debug-asyncify-wasm/Makefile
+++ b/packages/variant-quickjs-node-esm-debug-asyncify-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-esm-debug-sync-wasm/Makefile b/packages/variant-quickjs-node-esm-debug-sync-wasm/Makefile
index 8ded562f..72f92d2e 100644
--- a/packages/variant-quickjs-node-esm-debug-sync-wasm/Makefile
+++ b/packages/variant-quickjs-node-esm-debug-sync-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-esm-release-asyncify-wasm/Makefile b/packages/variant-quickjs-node-esm-release-asyncify-wasm/Makefile
index 7be70881..54061e78 100644
--- a/packages/variant-quickjs-node-esm-release-asyncify-wasm/Makefile
+++ b/packages/variant-quickjs-node-esm-release-asyncify-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/packages/variant-quickjs-node-esm-release-sync-wasm/Makefile b/packages/variant-quickjs-node-esm-release-sync-wasm/Makefile
index 4e01eb59..251e8ad8 100644
--- a/packages/variant-quickjs-node-esm-release-sync-wasm/Makefile
+++ b/packages/variant-quickjs-node-esm-release-sync-wasm/Makefile
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier
diff --git a/scripts/emcc.sh b/scripts/emcc.sh
index 8ea6390e..fd69be75 100755
--- a/scripts/emcc.sh
+++ b/scripts/emcc.sh
@@ -12,8 +12,13 @@ if [[ -z "$EMSDK_CACHE" ]]; then
   echo "EMSDK_CACHE must be set to a path"
 fi
 
+if [[ -z "$EMSDK_PROJECT_ROOT" ]]; then
+  echo "EMSDK_PROJECT_ROOT must be set to a path"
+fi
+
 DOCKER_ARGV=(
   run --rm
+  -v "$EMSDK_PROJECT_ROOT:$EMSDK_PROJECT_ROOT"
   -v "$(pwd):$(pwd)"
   -u "$(id -u):$(id -g)"
   -w "$(pwd)"
diff --git a/templates/Variant.mk b/templates/Variant.mk
index 48fd30da..558d8826 100644
--- a/templates/Variant.mk
+++ b/templates/Variant.mk
@@ -3,7 +3,7 @@ CC=clang
 EMSDK_VERSION=3.1.50
 EMSDK_DOCKER_IMAGE=emscripten/emsdk:3.1.50
 EMCC_SRC=../../scripts/emcc.sh
-EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
+EMCC=EMSDK_VERSION=$(EMSDK_VERSION) EMSDK_DOCKER_IMAGE=$(EMSDK_DOCKER_IMAGE) EMSDK_PROJECT_ROOT=$(REPO_ROOT) EMSDK_DOCKER_CACHE=$(REPO_ROOT)/emsdk-cache/$(EMSDK_VERSION) $(EMCC_SRC)
 GENERATE_TS_SRC=../../generate.ts
 GENERATE_TS=$(GENERATE_TS_ENV) npx ts-node $(GENERATE_TS_SRC)
 PRETTIER=npx prettier