title: Bundler SASS error with gem files
body: <p>getting this error on a new project - its driving me mad!</p>
  
  <p>its a minefield out there trying to figure all this stuff, jeez once I've got this sorted i'll defo make a simple to follow guide!! </p>
  
  <p>please please help</p>
  
  <pre><code>Bundler could not find compatible versions for gem "sass":
    In Gemfile:
      singularitygs (~&gt; 1.2.0) ruby depends on
        sass (~&gt; 3.3.0) ruby
  
  compass (~&gt; 0.12.3) ruby depends on
    sass (3.2.14)
  </code></pre>
  
  <p>my gem file</p>
  
  <pre><code># A sample Gemfile
  source "https://rubygems.org"
  
  # gem "rails"
  gem "compass", "~&gt; 0.12.3"
  gem "singularitygs", "~&gt; 1.2.0"
  gem "singularity-extras", "~&gt; 0.0.3"
  gem "breakpoint", "~&gt; 2.4.2"
  gem "jacket", "~&gt; 1.1.1"
  gem "toolkit", "~&gt; 2.0.1"
  gem "bourbon", "~&gt; 3.1.8"
  </code></pre>
  
  <p>heres the gems on my mac </p>
  
  <p>$ gem list</p>
  
  <p><strong>* LOCAL GEMS *</strong></p>
  
  <pre><code>actionmailer (4.0.4)
  actionpack (4.0.4)
  activemodel (4.0.4)
  activerecord (4.0.4)
  activerecord-deprecated_finders (1.0.3)
  activesupport (4.0.4, 3.2.17)
  arel (4.0.2)
  atomic (1.1.16)
  bigdecimal (1.2.5, 1.2.0)
  bourbon (3.1.8)
  breakpoint (2.4.2)
  builder (3.1.4)
  bundler (1.5.3)
  celluloid (0.15.2)
  celluloid-io (0.15.0)
  chunky_png (1.3.0)
  coffee-script (2.2.0)
  coffee-script-source (1.7.0)
  compass (1.0.0.alpha.19, 0.12.3)
  compass-core (1.0.0.alpha.19)
  compass-import-once (1.0.4, 1.0.3)
  erubis (2.7.0)
  execjs (2.0.2, 1.4.0)
  ffi (1.9.3)
  fssm (0.2.10)
  haml (4.0.5)
  hike (1.2.3)
  i18n (0.6.9)
  io-console (0.4.2)
  jacket (1.1.1)
  json (1.8.1, 1.7.7)
  kramdown (1.3.3, 1.3.2)
  listen (2.7.1, 1.1.6)
  mail (2.5.4)
  middleman (3.2.2)
  middleman-core (3.2.2)
  middleman-sprockets (3.3.1)
  mime-types (1.25.1)
  minitest (5.3.1, 4.3.2)
  modular-scale (2.0.4)
  multi_json (1.9.0)
  nio4r (1.0.0)
  polyglot (0.3.4)
  psych (2.0.4, 2.0.0)
  rack (1.5.2)
  rack-test (0.6.2)
  rails (4.0.4)
  railties (4.0.4)
  rake (10.1.1, 0.9.6)
  rb-fsevent (0.9.4)
  rb-inotify (0.9.3)
  rb-kqueue (0.2.2)
  rdoc (4.1.1, 4.0.0)
  sass (3.3.3, 3.3.1, 3.2.14)
  sassy-maps (0.3.2)
  sassy-math (1.5)
  singularity-extras (0.0.3)
  singularitygs (1.2.0)
  sprockets (2.12.0)
  sprockets-helpers (1.1.0, 1.0.1)
  sprockets-rails (2.0.1)
  sprockets-sass (1.0.3)
  susy (2.1.1, 1.0.9)
  test-unit (2.5.5, 2.0.0.0)
  thor (0.18.1)
  thread_safe (0.2.0)
  tilt (2.0.0, 1.4.1)
  timers (1.1.0)
  toolkit (2.0.1)
  treetop (1.4.15)
  tzinfo (0.3.39)
  uglifier (2.5.0, 2.4.0)
  </code></pre>
  
  <p>OK I think i'm getting there but still getting some errors </p>
  
  <p>my config.rb file</p>
  
  <pre><code>require 'compass/import-once/activate'
  require 'singularitygs'
  require 'singularity-extras'
  require 'breakpoint'
  require 'jacket'
  require 'toolkit'
  require 'bourbon'
  
  
  # Set this to the root of your project when deployed:
  http_path = "/"
  css_dir = "css"
  sass_dir = "sass"
  images_dir = "img".
  fonts_dir = "fonts"
  javascripts_dir = "js"
  
  # You can select your preferred output style here (can be overridden via the command line):
  output_style = :compact 
  
  # To enable relative paths to assets via compass helper functions. Uncomment:
  relative_assets = true
  
  # To disable debugging comments that display the original location of your selectors. Uncomment:
  # line_comments = false
  
  
  # If you prefer the indented syntax, you might want to regenerate this
  # project again passing --syntax sass, or you can uncomment this:
  preferred_syntax = :sass
  # and then run:
  # sass-convert -R --from scss --to sass sass scss &amp;&amp; rm -rf sass &amp;&amp; mv scss sass
  </code></pre>
  
  <p>my app.sass file</p>
  
  <pre><code>@import "compass"
  @import "singularitygs"
  @import "singularity-extras"
  @import "breakpoint"
  @import "jacket"
  @import "toolkit"
  @import "bourbon"
  // My sass
  @import "partials/normalize"
  </code></pre>
  
  <p>my Gemfile file</p>
  
  <p>source "<a href="https://rubygems.org" rel="nofollow">https://rubygems.org</a>"</p>
  
  <pre><code>gem "compass"
  gem "singularitygs"
  gem "singularity-extras"
  gem "breakpoint"
  gem "jacket"
  gem "toolkit"
  gem "bourbon"
  </code></pre>
  
  <p>the error</p>
  
  <pre><code>  error sass/app.sass (Line 2: File to import not found or unreadable: jacket.
  Load paths:
    /Applications/MAMP/htdocs/MachuPicchuMobile.com/7DayShapeUp/sass
    /Users/nathanielharman/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/compass-core-1.0.0.alpha.19/stylesheets
    /Users/nathanielharman/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/susy-2.1.1/sass
    Compass::SpriteImporter)
  overwrite css/app.css
       info sass/app.sass was modified
      error sass/app.sass (Line 2: File to import not found or unreadable: jacket.
  Load paths:
    /Applications/MAMP/htdocs/MachuPicchuMobile.com/7DayShapeUp/sass
    /Users/nathanielharman/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/compass-core-1.0.0.alpha.19/stylesheets
    /Users/nathanielharman/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/susy-2.1.1/sass
    Compass::SpriteImporter)
  identical css/app.css
       info sass/app.sass was modified
      error sass/app.sass (Line 2: File to import not found or unreadable: singularitygs.
  Load paths:
    /Applications/MAMP/htdocs/MachuPicchuMobile.com/7DayShapeUp/sass
    /Users/nathanielharman/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/compass-core-1.0.0.alpha.19/stylesheets
    /Users/nathanielharman/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/susy-2.1.1/sass
    Compass::SpriteImporter)
  overwrite css/app.css
  </code></pre>