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

I'm using

rvm 1.16.20 (version) by Wayne E. Seguin , Michal Papis [https://rvm.io/]

and also got the following error during bundle install

.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/yaml.rb:56:in `': It seems your ruby installation is missing psych (for YAML output). To eliminate this warning, please install libyaml and reinstall your ruby.

Here are three different ways to resolve this error w/o having to gem install psych

1. export LD_LIBRARY_PATH=/usr/local/lib

2. alter /etc/ld.so.conf

   sudo su - root
   echo /usr/local/lib64 >> /etc/ld.so.conf
   echo /usr/local/lib >> /etc/ld.so.conf
   ldconfig
   

3. Fix rvm ruby 1.9.3 installation via

   patch .rvm/scripts/functions/manage/ruby < ruby-1.9.3-LDFLAGS.patch
   rvm uninstall ruby-1.9.3-p194
   export LDFLAGS='-L /usr/local/lib64 -L/usr/local/lib -Xlinker -R/usr/local/lib64 -Xlinker -R/usr/local/lib'
   rvm install ruby-1.9.3-p194 --disable-binary
   grep configure_args .rvm/src/ruby-1.9.3-p194/config.log # to confirm LDFLAG
   

    $ diff  -c .rvm/{src/rvm/,}scripts/functions/manage/ruby
    *** .rvm/src/rvm/scripts/functions/manage/ruby  2012-11-10 06:28:14.000000000 +0000
    --- .rvm/scripts/functions/manage/ruby  2013-01-25 17:18:00.000000000 +0000
    ***************
    *** 106,123 ****
              # when relative is in effect libyaml is installed in ruby itself so it will be moved with ruby
              prefix_path="${rvm_rubies_path}/${rvm_ruby_string}" libyaml

    !         __rvm_update_configure_env CFLAGS="-I${rvm_rubies_path}/${rvm_ruby_string}/include"
    !         __rvm_update_configure_env LDFLAGS="-L${rvm_rubies_path}/${rvm_ruby_string}/lib"
              if [[ -d "${rvm_rubies_path}/${rvm_ruby_string}/lib64" ]]
    !         then __rvm_update_configure_env LDFLAGS="-L${rvm_rubies_path}/${rvm_ruby_string}/lib64"
              fi
            else
              libyaml_installed || libyaml # Installs libyaml

    !         __rvm_update_configure_env CFLAGS="-I${rvm_path}/usr/include"
    !         __rvm_update_configure_env LDFLAGS="-L${rvm_path}/usr/lib"
              if [[ -d "${rvm_path}/usr/lib64" ]]
    !         then __rvm_update_configure_env LDFLAGS="-L${rvm_path}/usr/lib64"
              fi
            fi

    --- 106,123 ----
              # when relative is in effect libyaml is installed in ruby itself so it will be moved with ruby
              prefix_path="${rvm_rubies_path}/${rvm_ruby_string}" libyaml

    !         __rvm_update_configure_env CFLAGS="-I${rvm_rubies_path}/${rvm_ruby_string}/include ${CFLAGS}"
    !         __rvm_update_configure_env LDFLAGS="-L${rvm_rubies_path}/${rvm_ruby_string}/lib ${LDFLAGS}"
              if [[ -d "${rvm_rubies_path}/${rvm_ruby_string}/lib64" ]]
    !         then __rvm_update_configure_env LDFLAGS="-L${rvm_rubies_path}/${rvm_ruby_string}/lib64 ${LDFLAGS}"
              fi
            else
              libyaml_installed || libyaml # Installs libyaml

    !         __rvm_update_configure_env CFLAGS="-I${rvm_path}/usr/include ${CFLAGS}"
    !         __rvm_update_configure_env LDFLAGS="-L${rvm_path}/usr/lib ${LDFLAGS}"
              if [[ -d "${rvm_path}/usr/lib64" ]]
    !         then __rvm_update_configure_env LDFLAGS="-L${rvm_path}/usr/lib64 ${LDFLAGS}"
              fi
            fi