diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..5e75bac
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,8 @@
+if [ -L ./result ]; then
+  echo "Found existing build; using flake_env"
+  source ./result/share/flake_env/direnvrc
+  use flake_env .
+else
+  echo "No existing build found; using direnv built-in flake support"
+  use flake .
+fi