diff --git a/.github/workflows/all.yml b/.github/workflows/all.yml
index 40f278b8..a3618a21 100644
--- a/.github/workflows/all.yml
+++ b/.github/workflows/all.yml
@@ -19,6 +19,10 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: true
+      - name: Set up MinGW
+        uses: egor-tensin/setup-mingw@v2
+        with:
+          platform: x64
       - run: make -Bj EXE=.exe CC='gcc' OPT='-Os -flto' OS=WINDOWS GCCJIT=NO
       - uses: actions/upload-artifact@v4
         with:
diff --git a/vendor/llvm-box b/vendor/llvm-box
new file mode 160000
index 00000000..ee28d22f
--- /dev/null
+++ b/vendor/llvm-box
@@ -0,0 +1 @@
+Subproject commit ee28d22f69b1fe3c70b437f4c99dd0139f3d1f28