diff --git a/.github/workflows/build-macos.yml b/.github/workflows/build-macos.yml
index 7b3541cd..7a57e260 100644
--- a/.github/workflows/build-macos.yml
+++ b/.github/workflows/build-macos.yml
@@ -16,10 +16,10 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: '1.17'
-      - name: Install QEMU
+      - name: Install Dependencies
         shell: bash
         run: |
-          HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu
+          HOMEBREW_NO_AUTO_UPDATE=1 brew install qemu binaryen
       - name: Install Xtensa toolchain
         shell: bash
         run: |
@@ -71,19 +71,6 @@ jobs:
       - name: Build wasi-libc
         if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
         run: make wasi-libc
-      - name: Cache Binaryen
-        uses: actions/cache@v2
-        id: cache-binaryen
-        with:
-          key: binaryen-macos-v1
-          path: build/wasm-opt
-      - name: Build Binaryen
-        if: steps.cache-binaryen.outputs.cache-hit != 'true'
-        run: |
-          # install dependencies
-          HOMEBREW_NO_AUTO_UPDATE=1 brew install cmake ninja
-          # build!
-          make binaryen
       - name: Test TinyGo
         shell: bash
         run: make test GOTESTFLAGS="-v -short"
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index f23d5e28..2039269a 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -15,10 +15,11 @@ jobs:
         uses: actions/setup-go@v2
         with:
           go-version: '1.17'
-      - name: Install Ninja
+      - uses: MinoruSekine/setup-scoop@v1
+      - name: Install Dependencies
         shell: bash
         run: |
-          choco install ninja
+          scoop install ninja binaryen
       - name: Checkout
         uses: actions/checkout@v2
         with:
@@ -69,15 +70,6 @@ jobs:
       - name: Build wasi-libc
         if: steps.cache-wasi-libc.outputs.cache-hit != 'true'
         run: make wasi-libc
-      - name: Cache Binaryen
-        uses: actions/cache@v2
-        id: cache-binaryen
-        with:
-          key: binaryen-windows-v2
-          path: build/wasm-opt.exe
-      - name: Build Binaryen
-        if: steps.cache-binaryen.outputs.cache-hit != 'true'
-        run: make binaryen
       - name: Test TinyGo
         shell: bash
         run: make test GOTESTFLAGS="-v -short"
diff --git a/Makefile b/Makefile
index fcc96f2f..f9902f7d 100644
--- a/Makefile
+++ b/Makefile
@@ -58,10 +58,13 @@ ifeq ($(OS),Windows_NT)
     CGO_LDFLAGS += -static -static-libgcc -static-libstdc++
     CGO_LDFLAGS_EXTRA += -lversion
 
-    BINARYEN_OPTION += -DCMAKE_EXE_LINKER_FLAGS='-static-libgcc -static-libstdc++'
+    USE_SYSTEM_BINARYEN ?= 1
 
 else ifeq ($(shell uname -s),Darwin)
     MD5SUM = md5
+
+    USE_SYSTEM_BINARYEN ?= 1
+
 else ifeq ($(shell uname -s),FreeBSD)
     MD5SUM = md5
     START_GROUP = -Wl,--start-group
@@ -172,6 +175,7 @@ $(LLVM_BUILDDIR)/build.ninja: llvm-source
 $(LLVM_BUILDDIR): $(LLVM_BUILDDIR)/build.ninja
 	cd $(LLVM_BUILDDIR) && ninja $(NINJA_BUILD_TARGETS)
 
+ifneq ($(USE_SYSTEM_BINARYEN),1)
 # Build Binaryen
 .PHONY: binaryen
 binaryen: build/wasm-opt$(EXE)
@@ -179,6 +183,7 @@ build/wasm-opt$(EXE):
 	mkdir -p build
 	cd lib/binaryen && cmake -G Ninja . -DBUILD_STATIC_LIB=ON $(BINARYEN_OPTION) && ninja bin/wasm-opt$(EXE)
 	cp lib/binaryen/bin/wasm-opt$(EXE) build/wasm-opt$(EXE)
+endif
 
 # Build wasi-libc sysroot
 .PHONY: wasi-libc
@@ -532,7 +537,7 @@ endif
 wasmtest:
 	$(GO) test ./tests/wasm
 
-build/release: tinygo gen-device wasi-libc binaryen
+build/release: tinygo gen-device wasi-libc $(if $(filter 1,$(USE_SYSTEM_BINARYEN)),,binaryen)
 	@mkdir -p build/release/tinygo/bin
 	@mkdir -p build/release/tinygo/lib/clang/include
 	@mkdir -p build/release/tinygo/lib/CMSIS/CMSIS
@@ -551,7 +556,9 @@ build/release: tinygo gen-device wasi-libc binaryen
 	@mkdir -p build/release/tinygo/pkg/armv7em-unknown-unknown-eabi
 	@echo copying source files
 	@cp -p  build/tinygo$(EXE)           build/release/tinygo/bin
+ifneq ($(USE_SYSTEM_BINARYEN),1)
 	@cp -p  build/wasm-opt$(EXE)         build/release/tinygo/bin
+endif
 	@cp -p $(abspath $(CLANG_SRC))/lib/Headers/*.h build/release/tinygo/lib/clang/include
 	@cp -rp lib/CMSIS/CMSIS/Include      build/release/tinygo/lib/CMSIS/CMSIS
 	@cp -rp lib/CMSIS/README.md          build/release/tinygo/lib/CMSIS