--- a/bitbucket-pipelines.yml	Tue Oct 25 12:35:33 2016 +0800
+++ b/bitbucket-pipelines.yml	Sun Sep 23 18:47:17 2018 +0800
@@ -1,8 +1,15 @@
 image: ubuntu:xenial
 
+definitions:
+  caches:
+    luarocks: ~/.cache/luarocks/
+
 pipelines:
   default:
     - step:
+        caches:
+          - luarocks
+
         script:
           - apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y
               build-essential lua5.1 luarocks mercurial