Cannot load such file -- bundler/bower

[devkat]

Environment:

• Mac OS X 10.11.3 (El Capitan)
• Homebrew 0.9.5
• rvm 1.26.11 (same problem occurs with rbenv)
• Bundler 1.11.2

Gemfile (excerpt):

source 'https://rubygems.org'
require 'bundler/bower'

asset "jquery", "~2.1.4"`

Observation:

bundle install

[!] There was an error parsing `Gemfile`: cannot load such file -- bundler/bower. Bundler cannot continue.

 #  from /Users/nobby/becompany/website/src/website-static/Gemfile:5
 #  -------------------------------------------
 #  
 >  require 'bundler/bower'
 #  
 #  -------------------------------------------

RubyGems Environment:

- RUBYGEMS VERSION: 2.5.1
- RUBY VERSION: 2.3.0 (2015-12-25 patchlevel 0) [x86_64-darwin15]
- INSTALLATION DIRECTORY: /Users/nobby/.rvm/gems/ruby-2.3.0
- USER INSTALLATION DIRECTORY: /Users/nobby/.gem/ruby/2.3.0
- RUBY EXECUTABLE: /Users/nobby/.rvm/rubies/ruby-2.3.0/bin/ruby
- EXECUTABLE DIRECTORY: /Users/nobby/.rvm/gems/ruby-2.3.0/bin
- SPEC CACHE DIRECTORY: /Users/nobby/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: /Users/nobby/.rvm/rubies/ruby-2.3.0/etc
- RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-darwin-15
- GEM PATHS:
    - /Users/nobby/.rvm/gems/ruby-2.3.0
    - /Users/nobby/.rvm/gems/ruby-2.3.0@global
- GEM CONFIGURATION:
    - :update_sources => true
    - :verbose => true
    - :backtrace => false
    - :bulk_threshold => 1000
- REMOTE SOURCES:
    - https://rubygems.org/
- SHELL PATH:
    - /Users/nobby/.rvm/gems/ruby-2.3.0/bin
    - /Users/nobby/.rvm/gems/ruby-2.3.0@global/bin
    - /Users/nobby/.rvm/rubies/ruby-2.3.0/bin
    - /Users/nobby/.rvm/bin
    - /Users/nobby/src/apache/ant/apache-ant-1.9.6/bin
    - /usr/local/bin
    - /usr/bin
    - /bin
    - /usr/sbin
    - /sbin

Maybe bundler is looking in the wrong gem paths? Any help is greatly appreciated – thanks a lot in advance!

[devkat]

Cross-post: http://stackoverflow.com/questions/36183670/bundler-cant-find-gem-bundler-bower