gem install fails: ERROR: Failed to build gem native extension

[tugberkugurlu]

When I run sudo gem install travis, I get the below error:

Fetching: multipart-post-2.0.0.gem (100%)
Fetching: faraday-0.9.2.gem (100%)
Fetching: faraday_middleware-0.10.0.gem (100%)
Fetching: highline-1.7.8.gem (100%)
Fetching: backports-3.6.8.gem (100%)
Fetching: multi_json-1.11.2.gem (100%)
Fetching: addressable-2.4.0.gem (100%)
Fetching: net-http-persistent-2.9.4.gem (100%)
Fetching: net-http-pipeline-1.0.1.gem (100%)
Fetching: gh-0.14.0.gem (100%)
Fetching: launchy-2.4.3.gem (100%)
Fetching: ffi-1.9.10.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing travis:
    ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:4:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/ffi-1.9.10 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/ffi-1.9.10/ext/ffi_c/gem_make.out

More info:

tugberk@ubuntu:~/Downloads$ ruby --version
ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]

tugberk@ubuntu:~/Downloads$ gem --version
1.8.23

any thoughts?

[tugberkugurlu]

After installing the below stuff, it started working:

$ sudo apt-get install python-software-properties
$ sudo apt-add-repository ppa:brightbox/ruby-ng
$ sudo apt-get update
$ sudo apt-get install ruby2.1 ruby-switch
$ sudo ruby-switch --set ruby2.1
$ sudo apt-get install ruby2.1-dev

[nolanlawson]

This worked for me on Bash on Windows as well. The sudo apt-get install ruby2.1-dev is key for building the native extensions apparently.

[gakyoo]

Worked for me too

[brianterry]

Worked! Thanks!

[cahkene]

thanks bro, this is worked

[big-kahuna-burger]

Thanks, it worked in Bash for Windows

[orpheus]

sudo apt-get install ruby-dev

worked for me

[seelaman]

+1 on just ruby-dev

[dineshsonachalam]

sudo apt-get install ruby-dev

Worked for me. Thanks.

[nomadster]

You need to install ruby-dev AND build-essentials

sudo apt-get install ruby-dev
sudo apt-get install build-essential