From: Max Williams <toastkid.williams@...>
Date: 2008-07-13T01:33:06+09:00
Subject: Can't install gems after a new ubuntu install

Sorry if this is the wrong forum...

Previously i'd been using ubuntu in a VM in windows.  Finally i've taken
the plunge and wiped windows completely and done a proper ubuntu
install.  (which was the easiest OS install i've EVER done btw - no
driver hassles or anything).

Anyway, i'm trying to get everything set up again for my work (rails
dev).  I've installed ruby and ruby-gems with apt.  Now i'm trying to
get some more gems, but i keep getting this problem (for hpricot in this
case but i also had it with ferret).

>max@max-laptop:~$ sudo gem install hpricot
>Select which gem to install for your platform (i486-linux)
> 1. hpricot 0.6 (jruby)
> 2. hpricot 0.6 (mswin32)
> 3. hpricot 0.6 (ruby)
> 4. hpricot 0.5 (ruby)
> 5. hpricot 0.5 (mswin32)
> 6. Skip this gem
> 7. Cancel installation
>> 3
>Building native extensions.  This could take a while...
>ERROR:  While executing gem ... (Gem::Installer::ExtensionBuildError)
>    ERROR: Failed to build gem native extension.
>
>ruby extconf.rb install hpricot
>extconf.rb:1:in `require': no such file to load -- mkmf (LoadError)
>  from extconf.rb:1
>
>
>Gem files will remain installed in /var/lib/gems/1.8/gems/hpricot-0.6 for >inspection.
>Results logged to /var/lib/gems/1.8/gems/hpricot-0.6/ext/hpricot_scan/gem_make.out

Doing "gem list" gives me these:

>*** LOCAL GEMS ***
>
>rake (0.8.1)
>    Ruby based make-like utility.
>
>sources (0.0.1)
>    This package provides download sources for remote gem installation
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