Error installing eventmachine gem

Question

When I run foreman start i get the following error:

pallav@pallav-System-Product-Name:~/Workspace/Aadvisor$ foreman start
10:04:32 web.1  | started with pid 11022 10:04:32 web.1  |
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/spec_set.rb:92:in
`block in materialize': Could not find eventmachine-0.12.10 in any of
the sources (Bundler::GemNotFound) 10:04:32 web.1  |  from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/spec_set.rb:85:in
`map!' 10:04:32 web.1  |  from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/spec_set.rb:85:in
`materialize' 10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/definition.rb:114:in
`specs' 10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/definition.rb:159:in
`specs_for' 10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/definition.rb:148:in
`requested_specs' 10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/environment.rb:18:in
`requested_specs' 10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/runtime.rb:13:in
`setup' 10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler.rb:120:in `setup'
10:04:32 web.1  |   from
/var/lib/gems/1.9.1/gems/bundler-1.3.5/lib/bundler/setup.rb:17:in
`<top (required)>' 10:04:32 web.1  |  from
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
10:04:32 web.1  |   from
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
10:04:32 web.1  | exited with code 1 10:04:32 system | sending SIGTERM
to all processes SIGTERM received
pallav@pallav-System-Product-Name:~/Workspace/Aadvisor$

i also did

sudo bundle install

again error: "An error occurred while installing eventmachine (0.12.10), and Bundler cannot continue. Make sure that gem install eventmachine -v '0.12.10' succeeds before bundling. "

now when i do

sudo gem install eventmachine -v '0.12.10'

i again get error which says:

"ERROR: Error installing eventmachine: ERROR: Failed to build gem native extension."

Please tell me what i'm missing.

Answer 1

In order to install eventmachine 1.0.3 on Ubuntu 14.04 you first need to run:

sudo apt-get install build-essential

then bundle install or gem install eventmachine

should be enough.

Note: If you have rbenv, remember to run rbenv rehash after a bundle install.