How do I install Ruby with libyaml on Ubuntu 11.10? - ruby-on-rails

Question

I installed ruby-1.9.3-p0 on my Ubuntu 11.10 wubi and then rubygems to get Rails set up.
This is my code:
sudo ruby setup.rb
I got this error:
"/usr/local/lib/ruby/1.9.1/yaml.rb:56:in'<top(required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby."
I installed libyaml and reinstalled Ruby but still it doesn't work.
The information changed and I have no idea what's wrong with it.

Answer 1

You must install the paquage libyaml-dev before installing ruby, if not you can still use extconf.rb for the missing library. So for this problem you can do (from the ruby install folder) :
cd ext/psych
ruby extconf.rb
make
make install
Extconf.rb is usefull for adding a library after have installed ruby.

Answer 2

Do the following:
you must have "curl" installed :sudo apt-get install curl
Go To this link RVM
Copy the command in the quick install box and Paste it in your command prompt
Type echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"' >> ~/.bashrc
Type ~/.bashrc
Type the following code:
sudo apt-get install build-essential libreadline6 libreadline6-dev zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion
Type: rvm install 1.9.3-p0
Type: rvm use 1.9.3-p0
Type: gem install rails
Have fun :)

Answer 3

Ok, after a failed attempt at installing RoR on my Ubuntu 11.10 box, I combined the tips from this page and from this resource: http://www.thegeekwork.com/how-to-install-ruby-on-rails-in-ubuntu-11-10/
This is the breakdown, step-by-step of what I just did to make this work (sorry if I didn't format this so great, I was just trying to keep it neat):
1) Fresh install of Ubuntu 11.10
2) me#Box:~$ sudo apt-get install curl
3) me#Box:~$ sudo apt-get install git
4) me#Box:~$ sudo apt-get update
5) me#Box:~$ sudo apt-get dist-update
6) me#Box:~$ sudo shutdown -r now
7) me#Box:~$ bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
8) me#Box:~$ gedit ~/.bashrc
9) add the following line to the end (and save the file)
[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"
10) me#Box:~$ source ~/.bashrc
11) me#Box:~$ type rvm | head -1
After executing above command you should be getting this output -
rvm is a function
You’ve successfully installed the RVM. Next, you are supposed to install additional dependencies. To find out those programs type -
12) me#Box:~$ rvm requirements
After the above command, install the additional packages recommended by RVM -
13) me#Box:~$ sudo apt-get install build-essential openssl libreadline6 libreadline6-dev curl git-core zlib1g zlib1g-dev libssl-dev libyaml-dev libsqlite3-0 libsqlite3-dev sqlite3 libxml2-dev libxslt-dev autoconf libc6-dev ncurses-dev automake libtool bison subversion
14) me#Box:~$ rvm install 1.9.2
(#14 takes a little while)
15) me#Box:~$ rvm use 1.9.2
(This selects the version you want to use)
(If you aren’t sure about the ruby version currently being used, then type -
ruby -v)
16) me#Box:~$ gem install rails
(this will take a little while...)
17) Make a sample application as a test...
me#Box:~$ rails new test_app
me#Box:~$ cd test_app
me#Box:~/test_app$ rails server
AND THAT"S WHERE THIS THING DIDN"T WORK. ARRRRRRRRRrrrrrrrrrrrrrgh.
So,
18) in your application folder ("test_app"), open Gemfile and uncomment "therubyracer" line
19) me#Box:~/test_app$ bundle install
20) me#Box:~/test_app$ rails server
Done, and done.
I don't understand why it set 0.0.0.0:3000 as the host address (I thought it would be 127.0.0.1), but quite frankly, that's not bothering me right now -- I got it to work (so far). Time to get going with some Rails! :D
I hope this helps anyone else who is looking to make this work! :)
Note: I realize that #13 repeats some of the things I already installed, but I don't care, I'm just doing what the thing says. :/
Note2: Holy learning curve on just posting an answer! I wasn't sure what was considered "code" and apparently the prompt is considered code. Makes sense now :)
Note3: This is my first "Answer" on StackOverflow! :D

Answer 4

If you are compiling ruby you might need libyaml-dev

Answer 5

Debian (and Ubuntu, etc.) packages that contain the files needed to install some other program from source usually end in -dev, e.g. libyaml-dev, so try installing that. Or just use rvm, it will actually install this for you.

Answer 6

Compling yaml from its source will make it work. I am running the same config as yours. I followed this http://collectiveidea.com/blog/archives/2011/10/31/install-ruby-193-with-libyaml-on-centos/. It definitely works.