Rails asset pipeline - issue compiling vendor assets

For reference see this gist: https://gist.github.com/1950329

My issue is that I'm deploying my application to heroku and the assets under vendor do not appear to be compiled into application.js and application.css

The application works fine in development environment on my local system.

A workaround has been to configure production.rb so that run time compilation is allowed if the asset is not found, this is less than ideal of course.

Anyone able to see anything wrong or suggest why vendor assets would not be compiled?

Heroku app environment: ruby 1.9.2p290 (2011-07-09 revision 32553) [x86_64-linux] Rails 3.2.1

Cheers