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Как исправить «в установке ruby ​​отсутствует Psy (для вывода YAML)». на CentOS?

После rvm установка на CentOS 5.8:

[rails@localhost ~]$ rvm -v
rvm 1.16.17
[rails@localhost ~]$ which ruby
~/.rvm/rubies/ruby-1.9.3-p286/bin/ruby
[rails@localhost ~]$ ruby -v
ruby 1.9.3p286 (2012-10-12 revision 37165) [i686-linux]
[rails@localhost ~]$ which gem
~/.rvm/rubies/ruby-1.9.3-p286/bin/gem

есть предупреждение:

$ gem -v
/home/rails/.rvm/rubies/ruby-1.9.3-p286/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.
1.8.24

Я последовал за совет:

$ rvm pkg install libyaml
Fetching yaml-0.1.4.tar.gz to /home/rails/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /home/rails/.rvm/src
Prepare yaml in /home/rails/.rvm/src/yaml-0.1.4.
Configuring yaml in /home/rails/.rvm/src/yaml-0.1.4.
Compiling yaml in /home/rails/.rvm/src/yaml-0.1.4.
Installing yaml to /home/rails/.rvm/usr

Please note that it's required to reinstall all rubies:

    rvm reinstall all --force

а потом:

$ rvm reinstall all --force
Removing /home/rails/.rvm/src/ruby-1.8.7-p371...
Removing /home/rails/.rvm/rubies/ruby-1.8.7-p371...
No binary rubies available for: centos/5.8/i386/ruby-1.8.7-p371.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.8.7-p371, this may take a while depending on your cpu(s)...
ruby-1.8.7-p371 - #downloading ruby-1.8.7-p371, this may take a while depending on your connection...
ruby-1.8.7-p371 - #extracting ruby-1.8.7-p371 to /home/rails/.rvm/src/ruby-1.8.7-p371
ruby-1.8.7-p371 - #extracted to /home/rails/.rvm/src/ruby-1.8.7-p371
Applying patch /home/rails/.rvm/patches/ruby/1.8.7/stdout-rouge-fix.patch
Applying patch /home/rails/.rvm/patches/ruby/1.8.7/no_sslv2.diff
ruby-1.8.7-p371 - #configuring
ruby-1.8.7-p371 - #compiling
ruby-1.8.7-p371 - #installing 
Removing old Rubygems files...
Installing rubygems-1.8.24 for ruby-1.8.7-p371 ...
Installation of rubygems completed successfully.
Saving wrappers to '/home/rails/.rvm/bin'.
ruby-1.8.7-p371 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.8.7-p371 - #importing default gemsets (/home/rails/.rvm/gemsets/)
Install of ruby-1.8.7-p371 - #complete 
Please be aware that you just installed a ruby that requires 2 patches just to be compiled on up to date linux system.
This may have known and unaccounted for security vulnerabilities.
Please consider upgrading to Ruby 1.9.3-286 which will have all of the latest security patches.
Making gemset ruby-1.8.7-p371 pristine.
Making gemset ruby-1.8.7-p371@global pristine.
Removing /home/rails/.rvm/src/ruby-1.9.3-p286...
Removing /home/rails/.rvm/rubies/ruby-1.9.3-p286...
No binary rubies available for: centos/5.8/i386/ruby-1.9.3-p286.
Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies.
Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.9.3-p286, this may take a while depending on your cpu(s)...
ruby-1.9.3-p286 - #downloading ruby-1.9.3-p286, this may take a while depending on your connection...
ruby-1.9.3-p286 - #extracting ruby-1.9.3-p286 to /home/rails/.rvm/src/ruby-1.9.3-p286
ruby-1.9.3-p286 - #extracted to /home/rails/.rvm/src/ruby-1.9.3-p286
ruby-1.9.3-p286 - #configuring
ruby-1.9.3-p286 - #compiling
ruby-1.9.3-p286 - #installing 
Removing old Rubygems files...
Installing rubygems-1.8.24 for ruby-1.9.3-p286 ...
Installation of rubygems completed successfully.
Saving wrappers to '/home/rails/.rvm/bin'.
ruby-1.9.3-p286 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
ruby-1.9.3-p286 - #importing default gemsets (/home/rails/.rvm/gemsets/)
Install of ruby-1.9.3-p286 - #complete 
Making gemset ruby-1.9.3-p286 pristine.
Making gemset ruby-1.9.3-p286@global pristine.

Жаль, предупреждение все еще есть:

$ gem -v
/home/rails/.rvm/rubies/ruby-1.9.3-p286/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.
1.8.24

Как мне избавиться от предупреждения?

ОБНОВЛЕНИЕ: (применяется rvm reinstall 1.9.3 --movable)

$ rvm reinstall 1.9.3 --movable
Removing /home/rails/.rvm/src/ruby-1.9.3-p286...
Removing /home/rails/.rvm/rubies/ruby-1.9.3-p286...
Fetching yaml-0.1.4.tar.gz to /home/rails/.rvm/archives
Extracting yaml-0.1.4.tar.gz to /home/rails/.rvm/src
Prepare yaml in /home/rails/.rvm/src/yaml-0.1.4.
Configuring yaml in /home/rails/.rvm/src/yaml-0.1.4.
Compiling yaml in /home/rails/.rvm/src/yaml-0.1.4.
Installing yaml to /home/rails/.rvm/rubies/ruby-1.9.3-p286
Installing Ruby from source to: /home/rails/.rvm/rubies/ruby-1.9.3-p286, this may take a while depending on your cpu(s)...
ruby-1.9.3-p286 - #downloading ruby-1.9.3-p286, this may take a while depending on your connection...
ruby-1.9.3-p286 - #extracting ruby-1.9.3-p286 to /home/rails/.rvm/src/ruby-1.9.3-p286
ruby-1.9.3-p286 - #extracted to /home/rails/.rvm/src/ruby-1.9.3-p286
Applying patch /home/rails/.rvm/patches/ruby/1.9.3/ruby-multilib.patch
Error running 'patch -F 25 -p1 -N -f -i /home/rails/.rvm/patches/ruby/1.9.3/ruby-multilib.patch', please read /home/rails/.rvm/log/ruby-1.9.3-p286/patch.apply.ruby-multilib.log
There has been an error applying the specified patches. Halting the installation.
Making gemset ruby-1.9.3-p286 pristine.
Making gemset ruby-1.9.3-p286@global pristine.

После rvm pkg install libyamlпереустановите Ruby 1.9.3:

 rvm reinstall 1.9.3 --with-libyaml-dir=/home/rails/.rvm/usr

кредит: https://stackoverflow.com/a/12882906/88597

sudo apt-get install libtool
sudo apt-get install libyaml-dev
rvm reinstall 1.9.3

Я все перепробовал, это решило мою проблему.

попробуй это:

rvm get head
rvm reinstall 1.9.3 --movable

Думаю, вам нужно установить libyaml:

$ 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 
$ make install

Ссылаться на: http://collectiveidea.com/blog/archives/2011/10/31/install-ruby-193-with-libyaml-on-centos/

Вы можете установить libyaml-devel из альтернативного репозитория (я использовал repoforge.org):

sudo rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
sudo rpm -ivh http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
sudo yum install -y libyaml-devel