Huh? What this should do? Install those gems from assets.rb?
This should be IMHO replaced by:
```
  BuildRequires: sass-rails => 3.2.3
  BuildRequires: coffee-rails => 3.2.1
  BuildRequires: uglifier >= 1.0.3
  BuildRequires: jquery-rails
  BuildRequires: jquery-ui-rails
  BuildRequires: therubyracer
  BuildRequires: less-rails
  BuildRequires: twitter-bootstrap-rails
```
and then later in %build section call:
```rake assets:precompile```