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+- Start Date: 2106-12-26
+- RFC PR: (leave this empty)
+- Yarn Issue: (leave this empty)
+
+# Summary
+
+Auto build on npm link/post install.
+
+# Motivation
+
+`git clone` yarn repo and `npm link` results in:
+
+``` sh
+$ yarn install
+module.js:339
+    throw err;
+    ^
+
+Error: Cannot find module '../lib-legacy/constants'
+    at Function.Module._resolveFilename (module.js:337:15)
+    at Function.Module._load (module.js:287:25)
+    at Module.require (module.js:366:17)
+    at require (module.js:385:17)
+    at Object.<anonymous> (/Users/hemanth/labs/yarn/bin/yarn.js:9:17)
+    at Module._compile (module.js:435:26)
+    at Object.Module._extensions..js (module.js:442:10)
+    at Module.load (module.js:356:32)
+    at Function.Module._load (module.js:311:12)
+    at Function.Module.runMain (module.js:467:10)
+```
+
+After 
+
+```
+npm run build
+```
+
+It works fine.
+
+
+# Detailed design
+
+It would be nice to have a post install, `run build` ?
+
+# How We Teach This
+
+Nothing new to teach here, it would just be a post install script.
+
+# Drawbacks
+
+Not that I can think of.
+
+# Alternatives
+
+None.
+
+# Unresolved questions
+
+Anything specific needed here? This is a follow up from [yarn#1416](https://github.com/yarnpkg/yarn/issues/1416)
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