diff --git a/stack.yaml b/stack.yaml
new file mode 100644
index 0000000..fa46794
--- /dev/null
+++ b/stack.yaml
@@ -0,0 +1,20 @@
+extra-deps:
+- monad-memo-0.4.1
+- multistate-0.7.1.1
+- yaml-0.8.18.1 # For Windows. See <https://github.com/snoyberg/yaml/pull/91>.
+- unsafe-0.0
+packages:
+- .
+- extra-dep: true
+  location:
+    commit: a4e3d155d604f22dedb88fe8de3eb2f240daeea4
+    git: git@github.com:lspitzner/butcher.git
+- extra-dep: true
+  location:
+    commit: 605855659b15ff190d1e9c0c9b5e981e379aed15
+    git: git@github.com:lspitzner/data-tree-print.git
+- extra-dep: true
+  location:
+    commit: 85af8e4f34ff013575c9acd9675b495ee7f10180
+    git: git@github.com:lspitzner/ghc-exactprint.git
+resolver: nightly-2016-09-04