use stackrc.example, and prompt user before copying
diff --git a/build_lxc.sh b/build_lxc.sh
index 3d0ad89..4c624aa 100755
--- a/build_lxc.sh
+++ b/build_lxc.sh
@@ -1,5 +1,12 @@
 #!/usr/bin/env bash
 
+# Use stackrc.example if stackrc is missing
+if [ ! -e ./stackrc ]; then
+    read -n1 -p "No stackrc present.  Copy stackrc.example to stackrc? (y/n) "
+    echo
+    [[ $REPLY = [yY] ]] && cp stackrc.example stackrc|| { echo "Aborting:  Missing stackrc"; exit 1; }
+fi
+
 # Source params
 source ./stackrc