diff --git a/activate b/activate
new file mode 100644
index 0000000..8a5c489
--- /dev/null
+++ b/activate
@@ -0,0 +1,11 @@
+[ -n "$BASH_SOURCE" ] \
+    || { echo 1>&2 "source (.) this with Bash."; exit 2; }
+(
+    cd "$(dirname "$BASH_SOURCE")"
+    [ -d .build/virtualenv ] || {
+        virtualenv .build/virtualenv
+        . .build/virtualenv/bin/activate
+        pip install -r requirements.txt
+    }
+)
+. "$(dirname "$BASH_SOURCE")/.build/virtualenv/bin/activate"
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..e69de29