diff --git a/.gitmodules b/.gitmodules
index 9a800849..bef11648 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -14,3 +14,6 @@
 [submodule "vendor/isocline"]
 	path = vendor/isocline
 	url = https://github.com/fastvm/minivm-isocline
+[submodule "vendor/llvm-box"]
+	path = vendor/llvm-box
+	url = https://github.com/fastvm/llvm-box
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