Unable to Install Guard

Posted by Dillmo on Ask Ubuntu See other posts from Ask Ubuntu or by Dillmo
Published on 2013-11-09T20:13:29Z Indexed on 2013/11/10 16:12 UTC
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Filed under:

13.10

|

ruby

|

gem

I've seen Guard and it's usefulness in web development and would like to install it. Naturally, I expected to be able to use sudo gem install guard to do so (yes, it is a Ruby Gem). However the installation errors out. Here is what I'm getting:

Building native extensions.  This could take a while...
ERROR:  Error installing guard:
    ERROR: Failed to build gem native extension.

        /usr/bin/ruby1.9.1 extconf.rb
/usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- mkmf (LoadError)
    from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
    from extconf.rb:4:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/ffi-1.9.3 for inspection.
Results logged to /var/lib/gems/1.9.1/gems/ffi-1.9.3/ext/ffi_c/gem_make.out

Does anyone know how I can fix this? Thanks for any help.

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