rubygems

Uninstall all installed gems, in OSX?

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There are instances where I would like to revert and uninstall all previous gem installations. For instance, I needed to assist a friend migrate their rails development machine to use RVM. As they had been previously using the system-wide gem, he was experiencing many headaches when working with multiple projects. Essentially, he was the poster-child … Read more

Rails: Installing PG gem on OS X – failure to build native extension

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It seems many others have had problems installing the pg gem. None of the solutions posed for others have worked for me. I have tried to install the pg gem and postgres.app. The pg gem won’t install. The first error I get is: An error occurred while installing pg (0.17.0), and Bundler cannot continue. Make … Read more

Ignoring GEM because its extensions are not built

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On both my work and home computers, I recently upgraded Ruby to 2.3.1, using ruby-install. I use chruby as my Ruby switcher. I started seeing this warning in my terminal: Ignoring bcrypt-3.1.11 because its extensions are not built. Try: gem pristine bcrypt –version 3.1.11 Ignoring bcrypt-3.1.10 because its extensions are not built. Try: gem pristine … Read more

Understanding the Gemfile.lock file

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After running the bundle install command, ‘Gemfile.lock‘ is created in the working directory. What do the directives inside that file mean? For example, let’s take the following file: PATH remote: . specs: gem_one (0.0.1) GEM remote: http://example.org/ specs: gem_two (0.0.2) gem_three (0.0.3) gem_four (0.0.4) PLATFORMS platform DEPENDENCIES gem_two gem_one! What do ‘PATH‘, ‘GEM‘, ‘PLATFORMS‘ and … Read more

Library not loaded: libmysqlclient.16.dylib error when trying to run ‘rails server’ on OS X 10.6 with mysql2 gem

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I’ve been struggling with this for some time. I’ve installed Rails 3, gem, mysql on my Snow Leopard machine. All was going well until I created my first project and tried to run rails server Upon running this I get: jontybrook$ rails server /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle: dlopen(/Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle, 9): Library not loaded: libmysqlclient.16.dylib (LoadError) Referenced from: /Library/Ruby/Gems/1.8/gems/mysql2-0.2.6/lib/mysql2/mysql2.bundle Reason: … Read more

Unresolved specs during Gem::Specification.reset:

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When launching Guard, I’m getting this output: $ guard WARN: Unresolved specs during Gem::Specification.reset: lumberjack (>= 1.0.2) ffi (>= 0.5.0) WARN: Clearing out unresolved specs. Please report a bug if this causes problems. What does this mean, and how do I fix it? Contents of Guardfile: guard ‘livereload’ do watch(%r{.+\.(css|js|html)$}) end guard ‘sass’, :input => … Read more

Installing libv8 gem on OS X 10.9+

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I’m trying to install libv8 3.16.14.3 but getting an error on OSX Mavericks using latest stable rvm and ruby-1.9.3-p125. This is the output of running the command ‘gem install libv8’: ~/src(branch:master) » gem install libv8 Fetching: libv8-3.16.14.3.gem (100%) Building native extensions. This could take a while… ERROR: Error installing therubyracer: ERROR: Failed to build gem … Read more

Uninitialized constant ActiveSupport::Dependencies::Mutex (NameError)

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When I want to create a Ruby on Rails project, I get the message below. /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:55: uninitialized constant ActiveSupport::Dependencies::Mutex (NameError) from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require’ from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require’ from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support.rb:57 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require’ from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require’ from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:31 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require’ from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in `require’ from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/bin/rails:15 from /usr/bin/rails:19:in `load’ from /usr/bin/rails:19 What has gone wrong? How do … Read more

rmagick gem install “Can’t find Magick-config”

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I get the error shown below when attempting to install the rmagick gem. I am on Snowleopard 10.6 using RVM, Ruby 1.9.2-head and Rails 3.05. Responses to similar questions recommended installing ImageMagick, which I successfully did. Other suggested installing the “libmagick9-dev library”, however, I can not figure out how to do this. I’m a new … Read more