How do I install Ruby with libyaml on Ubuntu 11.10?

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:

1. you must have "curl" installed : sudo apt-get install curl
2. Go To this link RVM
3. Copy the command in the quick install box and Paste it in your command prompt
4. Type echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && source "$HOME/.rvm/scripts/rvm"' >> ~/.bashrc
5. Type ~/.bashrc
6. 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
7. Type: rvm install 1.9.3-p0
8. Type: rvm use 1.9.3-p0
9. Type: gem install rails
10. 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 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

如果您正在编译ruby，则可能需要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 , eg 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.