diff --git a/StanHeaders/.prepare b/StanHeaders/.prepare
new file mode 100644
index 000000000..3c67128e9
--- /dev/null
+++ b/StanHeaders/.prepare
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+git checkout --recurse-submodules experimental
+
+rm cleanup
+rm cleanup.win
+
+cp -Rf inst/include/upstream/src inst/include/src || true
+cp -Rf inst/include/upstream/lib/stan_math inst/include/mathlib || true
+cp -Rf inst/include/upstream/lib/stan_math/stan inst/include/stan || true
+cp -Rf inst/include/upstream/lib/stan_math/lib/sundials_* inst/include/libsundials || true
+cp -Rf inst/include/upstream/lib/stan_math/lib/sundials_*/include/* inst/include/ || true
+cp -Rf inst/include/upstream/lib/stan_math/lib/sundials_*/src/* src/ || true