erro de compilação dos recursos do bootstrap-sass dos trilhos - variável indefinida

todas as estradas apontam para bootstrap-sass

Cadeia de referência:

railscast-328 (noções básicas de bootstrap do twitter) refere-se ahttp://www.sitepoint.com/twitter-bootstrap-less-and-sass-understanding-your-options-for-rails-3-1/ que se refere ahttps://github.com/jlong/sass-bootstrap que por sua vez exclama que existe um novo porto oficial de bootstrap para sasshttps://github.com/twbs/bootstrap-sass que é outra das opções no artigo twitter-bootstrap

É relatado como um problema com a gema bootstrap-rails:https://github.com/anjlab/bootstrap-rails/issues/91

Acredito que o instalei corretamente

As gemas

gem 'sass-rails', '>= 3.2' # sass-rails needs to be higher than 3.2
gem 'bootstrap-sass', '~> 3.1.1'

estão instalados (tentados dentro e fora do grupo de ativos), application.css.scss contém

@import "bootstrap";

só.

mas isso me dá um erro

Ao tentarbundle exec rake assets:precompile dá este erro:

rake aborted!
Undefined variable: "$alert-padding".
  (in /home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/bootstrap-sass-3.1.1.0/vendor/assets/stylesheets/bootstrap/_alerts.scss)
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/bootstrap-sass-3.1.1.0/vendor/assets/stylesheets/bootstrap/_alerts.scss:10
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/script/variable.rb:49:in `_perform'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/script/node.rb:40:in `perform'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:298:in `visit_prop'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:100:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `map'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:121:in `with_environment'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:108:in `visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `block in visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:320:in `visit_rule'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:100:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `block in visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `map'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:53:in `visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:109:in `block in visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:121:in `with_environment'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:108:in `visit_children'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `block in visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:128:in `visit_root'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/base.rb:37:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:100:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/visitors/perform.rb:7:in `visit'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/tree/root_node.rb:20:in `render'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/engine.rb:315:in `_render'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-3.2.7/lib/sass/engine.rb:262:in `render'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sass-rails-3.2.6/lib/sass/rails/template_handlers.rb:106:in `evaluate'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/tilt-1.3.7/lib/tilt/template.rb:77:in `render'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/context.rb:193:in `block in evaluate'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/context.rb:190:in `each'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/context.rb:190:in `evaluate'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/processed_asset.rb:16:in `initialize'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/base.rb:18:in `new'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/base.rb:18:in `block in build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:270:in `circular_call_protection'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/base.rb:14:in `build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:93:in `block in build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/caching.rb:19:in `cache_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:92:in `build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:169:in `find_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/index.rb:14:in `find_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/bundled_asset.rb:12:in `initialize'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/base.rb:22:in `new'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/base.rb:22:in `build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:93:in `block in build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/caching.rb:19:in `cache_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/index.rb:92:in `build_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:169:in `find_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/index.rb:14:in `find_asset'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/static_compiler.rb:41:in `block in compile'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:219:in `block in each_logical_path'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:206:in `block (2 levels) in each_file'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:196:in `each'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:196:in `each_entry'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:204:in `block in each_file'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:203:in `each'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:203:in `each_file'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/sprockets-2.2.2/lib/sprockets/base.rb:217:in `each_logical_path'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/sprockets_overrides/static_compiler.rb:29:in `compile'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/tasks/assets.rake:108:in `internal_precompile'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/turbo-sprockets-rails3-0.3.11/lib/turbo-sprockets/tasks/assets.rake:115:in `block (3 levels) in <top (required)>'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `call'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:246:in `block in execute'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `each'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:241:in `execute'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:184:in `block in invoke_with_call_chain'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:177:in `invoke_with_call_chain'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/task.rb:170:in `invoke'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:143:in `invoke_task'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block (2 levels) in top_level'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `each'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:101:in `block in top_level'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:110:in `run_with_threads'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:95:in `top_level'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:73:in `block in run'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:160:in `standard_exception_handling'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/lib/rake/application.rb:70:in `run'
/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/rake-10.0.4/bin/rake:33:in `<top (required)>'
/home/joe/.rbenv/versions/1.9.3-p448/bin/rake:23:in `load'
/home/joe/.rbenv/versions/1.9.3-p448/bin/rake:23:in `<main>'

Eu verifiquei isso/home/joe/.rbenv/versions/1.9.3-p448/lib/ruby/gems/1.9.1/gems/bootstrap-sass-3.1.1.0/vendor/assets/stylesheets/bootstrap.scss realmente importa o arquivo _variables.scss abaixo dele no diretóriobootsrap/ primeiro diretório (antes de _alerts.scss etc), e ele faz ... e em _variables.scss define $ alert_padding.

Eu suspeito que estou perdendo algo óbvio

Noenvironments/production.rb Eu comentei tudo sobre os ativos e tentei apenasconfig.assets.initialize_on_precompile = true de acordo com o manualhttps://github.com/twbs/bootstrap-sass

pesquisa até agorabootstrap-sass: variável indefinida: "$ baseLineHeight"Estrutura adequada de ativos SCSS no RailsUsando o bootstrap do twitter com pipeline de ativos de trilhos e menoshttps://github.com/twbs/bootstrap-sass/issues/79#issuecomment-4428595tentando importar o bootstrap via bootstrap-sass no heroku, mas obtendo um errohttps://github.com/twbs/bootstrap-sasshttps://github.com/anjlab/bootstrap-rails/issues/91railscast 328, 329 e 268 procurando pistaspesquisando sobremodificar o bootstrap / bootstrap.scss do gem para usar sublinhado e .scss, diversos ajustes, como comentar linhas relacionadas a ativos emenvironments/production.rb, comentando apenas o da página da gema (manual)config.assets.initialize_on_precompile = trueproblema identificado

Copiei o conteúdo da gema no meu diretório de ativos, que é essencialmente o que a inicialização do jlong fez.

não está olhandoapplication.css.scss... está ignorando o que eu coloco lá e optando por examinar as pastas e carregar esses arquivos. É por isso que ele vê o alert.scss primeiro. Tentei alterar o nome de _variables.scss para _aavariables.scss sem sucesso