how to solve “ruby installation is missing psych” error?

Question

I used rvm to install ruby 1.9.3. even though it was successfully installed, it complained about libyaml. and now every time i wanna install a gem (say rails) this warning s

Answer 1

When I switch from 64 bit to 32 bit on Snow Leopard 10.6.8, I had reinstalled ruby (used rvm) to run on 32bit and met the same problem. So I just 'cleanup' all thing that cached by rvm before and problems solved. Hope this tip can help someone.

rvm cleanup all

rvm install ruby_version_here //(This way, rvm will also re-download newest yaml).

BTW, if you still meet this problem, I think you can try:

gem install psych

Answer 2

None of these answers worked for me.

I found my answer on https://github.com/sstephenson/ruby-build/issues/119 I am on Centos 6.3 Virtual Machine.

YOU MUST install libyaml before you install ruby. IF you ALREADY installed ruby you must get rid of the files before compiling source again!!!

# cd to your ruby source location
rm -rf /usr/local/lib/ruby # clean out ruby files
./configure
make && make install
gem -v # check if error is fixed

Answer 3

On CentOS 6.3 none of the above worked. However installing libyaml from source before installing ruby resolved the problem.

$ wget http://pyyaml.org/download/libyaml/yaml-0.1.4.tar.gz
$ tar xzvf yaml-0.1.4.tar.gz
$ cd yaml-0.1.4
$ ./configure --prefix=/usr/local
$ make
$ sudo make install

and then

rvm install 1.9.3
gem install rails

Answer 4

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 http://apt.sw.be/redhat/el5/en/x86_64/dag/RPMS/rpmforge-release-0.3.6-1.el5.rf.x86_64.rpm
% 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

Answer 5

On Snow Leopard, the solution by Catharz did not work for me. This solution, however, did:

brew install libyaml
rvm get head
rvm reinstall 1.9.3  --with-gcc=clang

(The rvm reinstall gave me a warning about clang not having the option "--with-libyaml" but it solved the error message regardless.)

Answer 6

sudo port install libyaml # or brew install libyaml
rvm get latest
rvm pkg install iconv
rvm pkg install openssl
rvm reinstall 1.9.3 --with-openssl-dir=~/.rvm/usr --with-iconv-dir=~/.rvm/usr

curl -OL http://rubyforge.org/frs/download.php/75414/linecache19-0.5.13.gem
curl -OL http://rubyforge.org/frs/download.php/75415/ruby-debug-base19-0.11.26.gem

gem install linecache19-0.5.13.gem ruby-debug-base19-0.11.26.gem -- --with-ruby-include=$rvm_path/src/ruby-1.9.3-p125/
gem install ruby-debug19

rvm reload

reload your .rvmrc (cd out, cd in)

bundle