how to solve "ruby installation is missing psych" error?

I tried all of these answers and still wasn't able to get it working. I installed libyaml with homebrew and then installed Ruby 1.9.3 and 2.0.0 with rvm. Each time it complained that I was missing psych (libyaml). But trying to install libyaml told me it was already installed. Rinse, repeat. Urgh.

Finally, what I did was to *uninstall* libyaml. Then I [enabled autolibs in rvm](

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), which (at least in OSX) allows rvm to install and manage dependencies more directly. Now when I installed the Rubies, rvm was able to install libyaml and recognize that it was in the right spot.

So if you've tried all of the other options, try actually *removing* libyaml and then installing your Rubies. It's count-intuitive from the error messages, but that's what finally worked for me.

$ brew doctor
$ brew link libyaml

I reinstalled ruby 1.9.3 with libyaml support:

rvm reinstall 1.9.3 --with-libyaml

I made sure that I would use 1.9.3 before installing psych:

rvm use 1.9.3

I installed psych:

gem install psych

NON-RVM ruby install method.

% uname -a
Linux localhost.localdomain 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22 00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

% cat /etc/redhat-release
CentOS release 6.4 (Final)

% wget

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% sudo rpm -K rpmforge-release-0.3.6-1.el5.rf.*.rpm"
% sudo rpm -ivh rpmforge-release-0.3.6-1.el5.rf.*.rpm"

DISABLE rpmforge by editing this file and set enabled=0
% sudo vi /etc/yum.repos.d/rpmforge.repo

% grep rpmforge ~/.aliases
alias rpmforge "sudo yum --disablerepo='*' --enablerepo='rpmforge'"

% rpmforge install libyaml libyaml-devel

% sudo yum list installed | grep libyaml
libyaml.x86_64 0.1.4-1.el5.rf @rpmforge
libyaml-devel.x86_64 0.1.4-1.el5.rf @rpmforge

The libyaml-devel is the key.

% tar zxvf ruby-1.9.3-p448.tar.gz
% cd ruby-1.9.3-p448
% ./configure -prefix=$HOME/ruby-1.9.3-p448
% make ; make install
% cd $HOME; ln -s ./ruby-1.9.3-p448 ruby

Update your path and source .cshrc

% echo $PATH
/home/francis/ruby/bin:/usr/sbin:/home/francis/bin:/home/francis/jdk1.7.0_25/bin:/usr/lib64/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin

% which ruby
/home/francis/ruby/bin/ruby

% gem update --system

Set your GEM_HOME in .cshrc and source

% echo $GEM_HOME
% /home/francis/ruby/lib/ruby/gems

% gem install mysql2 pg ruby-debug-ide rails capistrano capistrano-ext passenger

I got this fixed finally. The issue was that even though I installed libyaml with brew, it was never linked. I had to remove a conflicting header file and then `brew link libyaml`.

Installing ruby with rvm for mac osx, use autolibs to install libyaml and first uninstalling libyaml helps.

This worked for me:

brew uninstall libyaml
rvm autolibs enable
rvm reinstall ruby-2.1.1

I had similar problem after OSX upgrade, this what solves my problem:

brew rm libyaml
brew cleanup libyaml
brew install libyaml
brew rm openssl
brew cleanup openssl
brew install openssl
rvm remove *your version*
rvm install *latest version*

[found here][1]


[1]:

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If you are building ruby from source (I built 1.9.3 on Fedora 20), you will need this before you do the configure/make to build ruby:

yum install libyaml-devel

(in addition to yum install libyaml.) Similar to Francis's answer using rpmforge above.

rvm pkg install libyaml
$LIBYAML_PATH will be the path where RVM installs the upated yaml
rvm get stable
rvm reinstall all --force --with-libyaml-dir=$LIBYAML_PATH

If you have installed ruby on macOS with homebrew, [try this solution](

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).

`rm -rf /usr/local/lib/ruby/gems/ && brew reinstall ruby `

Note that this will get rid of all installed gems. Best save a list of installed gems with `gem list` before you run this.