Conflicting ruby versions

I am having problems with conflicting versions of Ruby that I have开发者_高级运维 installed. I had 1.8.6 and then installed 1.8.7 and it has caused problems. I get the following error when trying to run my ruby on rails app:

/usr/local/lib/ruby/1.8/i686-linux/rbconfig.rb:7: ruby lib version (1.8.6) doesn't match executable version (1.8.7) (RuntimeError)

I would like to remove 1.8.7 somehow and just use 1.8.6 but have no idea how to go about doing this.

Ran into this same issue and thought I'ld share my findings. There was a 1.8.7 ruby version installed by an rpm (centos 6.3), and I compiled 1.9.3 from sources and put it in a directory /opt/upnxt/ruby. I changed my environment to:

export PATH=/opt/upnxt/ruby/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin
export LD_LIBRARY_PATH=/opt/upnxt/ruby/lib64
export RUBYPATH=/opt/upnxt/ruby/bin
export RUBY_HOME=/opt/upnxt/ruby
export RUBYLIB=/opt/upnxt/ruby/lib64/ruby/1.9.1:/opt/upnxt/ruby/lib64/ruby/1.9.1/x86_64-linux
export GEM_HOME=/opt/upnxt/ruby/lib64/ruby/1.9.1
export GEM_PATH=/opt/upnxt/ruby/lib64/ruby/1.9.1:/opt/upnxt/ruby/lib64/ruby/gems/1.9.1

and then when running:

$ ruby /opt/upnxt/ruby/bin/gem environment
RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.23
  - RUBY VERSION: 1.9.3 (2012-11-10 patchlevel 327) [x86_64-linux]
  - INSTALLATION DIRECTORY: /opt/upnxt/ruby/lib64/ruby/1.9.1
  - RUBY EXECUTABLE: /usr/bin/ruby
  - EXECUTABLE DIRECTORY: /opt/upnxt/ruby/lib64/ruby/1.9.1/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86_64-linux
  - GEM PATHS:
     - /opt/upnxt/ruby/lib64/ruby/1.9.1
     - /opt/upnxt/ruby/lib64/ruby/gems/1.9.1
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
  - REMOTE SOURCES:
     - http://rubygems.org/

When running without the 'ruby' command in front, I would get:

$ /opt/upnxt/ruby/bin/gem environment
/opt/upnxt/ruby/lib64/ruby/1.9.1/x86_64-linux/rbconfig.rb:7: ruby lib version (1.9.3) doesn't match executable version (1.8.7) (RuntimeError)
    from /opt/upnxt/ruby/lib64/ruby/1.9.1/rubygems.rb:31:in `require'
    from /opt/upnxt/ruby/lib64/ruby/1.9.1/rubygems.rb:31
    from /opt/upnxt/ruby/bin/gem:8:in `require'
    from /opt/upnxt/ruby/bin/gem:8

because of the default #!/usr/bin/ruby as stated earlier. I guess that's why one should use "#!/bin/env ruby" as a shebang instead (or "#!/usr/bin/env ruby")

If someone can tell me how to change the "RUBY EXECUTABLE" from the "gem environment" output so I won't need to specify it on the commandline, I would be grateful

cheers,

Gerrit

Yes, setting the path:

export PATH=yourrubypath/bin:$PATH

should do it.

I recommend you install rvm, that way you can run different ruby versions and manage gem sets in a very easy way

The installation instructions are here. However it basically reduces to:

bash < <( curl http://rvm.beginrescueend.com/releases/rvm-install-head )

Then you can install a newer ruby from source (it will compile it!):

$ rvm install 1.9.1 ; rvm 1.9.1

$ ruby -v

ruby 1.9.1p243 (2009-07-16 revision 24175) [x86_64-linux]

$ which ruby

/home/you/.rvm/ruby-1.9.1-p243/bin/ruby

You can go back to the "system" one doing:

$ rvm system

Just change your $PATH to point to the version you want.

I install ruby from the tarball (and not from the distribuition package). This way I can have several different versions working at the same time, I have just to update the $PATH in the session that I want to use a different version.

Your easiest path and future proof too would be using rvm. Download the version of ruby you want with rvm and make it the default.

Installation: http://rvm.beginrescueend.com/rvm/install/

Making it default:
rvm 1.8.6 --default

The whole process would take not more than 15 minutes. Everything is clearly explained in this. Your environment will be set before you finish watching this podcast:
http://railscasts.com/episodes/200-rails-3-beta-and-rvm