Missing variable declarations in bootstrap_subtheme

How to reproduce:

git clone --branch 7.x-3.x http://git.drupal.org/project/bootstrap.git
cp -R bootstrap/bootstrap_subtheme/ bootstrap_subtheme/
#(copy bootstrap from http://getbootstrap.com/ to bootstrap_subtheme)
cd bootstrap_subtheme
lessc less/style.less css/style.css

Error:
180 color: @errorText;

All missing variables:
// Errors
@errorText
@errorBorder
@errorBackground
@placeholderText
@inputBorder
@green
@grayLighter

Patch included