Error installing rcov gem on ubuntu 7.1

Rails
1

I am running Ubuntu 7.1 and getting the following error when trying to
install rcov. What do i do?

dev@localhost:~$ sudo gem install rcov
Select which gem to install for your platform (i486-linux)

  1. rcov 0.8.1.2.0 (mswin32)
  2. rcov 0.8.1.2.0 (ruby)
  3. rcov 0.8.1.1.0 (ruby)
  4. rcov 0.8.1.1.0 (mswin32)
  5. Skip this gem
  6. Cancel installation

2
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 rcov
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/rcov-0.8.1.2.0
for
inspection.
Results logged to
/var/lib/gems/1.8/gems/rcov-0.8.1.2.0/ext/rcovrt/gem_make.out

dev@localhostt:~$

–
Ikenna C. Nwaiwu
Linkedin: Ikenna N.

2

No worries. Was able to get it to work with
sudo apt-get install rcov

Cheers
Ikenna

---------- Forwarded message ----------
From: Ikenna N. [email protected]
Date: Thu, Nov 13, 2008 at 10:42 AM
Subject: error installing rcov gem on ubuntu 7.1
To: [email protected]

I am running Ubuntu 7.1 and getting the following error when trying to
install rcov. What do i do?

dev@localhost:~$ sudo gem install rcov
Select which gem to install for your platform (i486-linux)

  1. rcov 0.8.1.2.0 (mswin32)
  2. rcov 0.8.1.2.0 (ruby)
  3. rcov 0.8.1.1.0 (ruby)
  4. rcov 0.8.1.1.0 (mswin32)
  5. Skip this gem
  6. Cancel installation

2
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 rcov
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/rcov-0.8.1.2.0
for
inspection.
Results logged to
/var/lib/gems/1.8/gems/rcov-0.8.1.2.0/ext/rcovrt/gem_make.out

dev@localhostt:~$

–
Ikenna C. Nwaiwu
Linkedin: Ikenna N.

3

I think the recommended way is to do the following

sudo apt-get install build-essential

Then install gems the normal way. Otherwise you will be dependent on
ubuntu repositories for all your gems with native extensions, and you
may be stuck a few versions behind (or completely without – is
Nokogiri, for example, available at all yet?)

– Mark.