redmine: Solution for: „cannot load such file — fcgi (LoadError)“

The following error appeared:

/usr/lib64/ruby/gems/2.0.0/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:251:in `require': cannot load such file -- fcgi (LoadError)
	from /usr/lib64/ruby/gems/2.0.0/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:251:in `block in require'
	from /usr/lib64/ruby/gems/2.0.0/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:236:in `load_dependency'
	from /usr/lib64/ruby/gems/2.0.0/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:251:in `require'
	from /usr/lib64/ruby/gems/2.0.0/gems/rack-1.4.5/lib/rack/handler/fastcgi.rb:1:in `<top (required)>'
	from /srv/www/vhosts/....../redmine/public/dispatch.fcgi:23:in `<main>'

I added to the Gemfile

gem "fcgi"

and to the dispatch.fgi

require 'rubygems'
require 'fcgi'

Then I updated the bundle with „bundle update“