command-t vim "Could not load C extension"

Question

When I hit \t to use the Command-T extension in VIM, I get the error

command-t.vim could not load the C extension

I'm not sure how to go about fixing this... any suggestions?

Thanks

---

I am using the git-repository installation method. Here's what happens when I "rake make":

~/.vim/bundle/command-t$ rake make
(in /home/petef/.vim/bundle/command-t)
/usr/bin/ruby1.8 extconf.rb
extconf.rb:24:in `require': no such file to load -- mkmf (LoadError)
    from extconf.rb:24
rake aborted!
Command failed with status (1): [/usr/bin/ruby1.8 extconf.rb...]
/home/petef/.vim/bundle/command-t/Rakefile:136
(See full trace by running task with --trace)

Answer 1

Pete, you must install ruby-dev package before invoke "rake make" command.

Answer 2

Command-T requires a compiled C extension to work. Here's the relevant section from the Command-T homepage on how to compile the extension:

The C extension must also be then compiled; for instance, if Vimball installs
your plugin files in ~/.vim, then you would do this: 

  cd ~/.vim/ruby/command-t 
  ruby extconf.rb 
  make 

Note that Command-T requires a version of VIM with Ruby support enabled, and 
it must be compiled using the same version of Ruby that Vim itself links 
against. For more details see the documentation: 

    http://git.wincent.com/command-t.git/blob_plain/HEAD:/README.txt

Answer 3

The thing that usually trips people up the most is that their Command-t has been compiled with a different version of Ruby than their Vim's version. In order do install Ruby and match the proper versions, you are going to want to install RVM and Ruby, install the correct version of Ruby, and do a rake make in the ~/.vim/bundle/Command-T plugin directory.

Here is a step-by-step guide to install Command-t.