Ruby on Rails

Try using Sudo

Also, Xcode could be out of date re: this problem (http://railsforum.com/viewtopic.php?id=22116) 

On Wed, Dec 28, 2011 at 11:22 AM, Krishna P. <lists@ruby-forum.com> wrote:

Hello all,
I am stuck and I need your help. I tried to install rails and got the
mkmf error. I installed ruby1.8-dev and I am still getting the same
error.

Rails install error:
--------------------
root@localhost:~# gem install rails
Building native extensions.  This could take a while...
ERROR:  Error installing rails:
       ERROR: Failed to build gem native extension.

/usr/bin/ruby1.9.1 extconf.rb
<internal:lib/rubygems/custom_require>:29:in `require': no such file to
load -- mkmf (LoadError)
       from <internal:lib/rubygems/custom_require>:29:in `require'
       from extconf.rb:1:in `<main>'


Gem files will remain installed in /var/lib/gems/1.9.1/gems/json-1.6.4
for inspection.
Results logged to
/var/lib/gems/1.9.1/gems/json-1.6.4/ext/json/ext/parser/gem_make.out



Proof of ruby1.8-dev installation
----------------------------------
root@localhost:~# apt-get install ruby1.8-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
ruby1.8-dev is already the newest version.
The following packages were automatically installed and are no longer
required:
 libactionmailer-ruby1.8 linux-headers-2.6.35-25-server
libcmdparse2-ruby1.8
 libtext-format-ruby1.8 libtmail-ruby1.8 libmocha-ruby1.8
 libactivesupport-ruby1.8 libredcloth-ruby1.8 libjs-prototype
 libmemcache-client-ruby1.8 linux-headers-2.6.35-22-server
 libactionpack-ruby1.8 libactiveresource-ruby1.8 libsqlite3-ruby1.8
 liblog4r-ruby1.8 libbuilder-ruby1.8 libncurses-ruby1.8
 linux-headers-2.6.35-23-server librack-ruby libtzinfo-ruby1.8
 linux-headers-2.6.35-22 linux-headers-2.6.35-23
linux-headers-2.6.35-24
 linux-headers-2.6.35-25 linux-headers-2.6.35-27 libdaemons-ruby1.8
 linux-headers-2.6.35-27-server libactiverecord-ruby1.8 librack-ruby1.8
 wwwconfig-common rubygems1.8 linux-headers-2.6.35-24-server
libjs-jquery
 libi18n-ruby1.8 javascript-common
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 113 not upgraded.

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