Rails - Sep 2011 - Can't upgrade Rails - Failed to build gem native extension.

I am new to Rails and attempting to upgrade Rails on my Mac to latest
version so that I can follow the rails tutorial, but I just can''t seem
to get anywhere.

When I attempt to update rails with: $ sudo gem update rails -y, I
receive the following error.

ERROR:  Error installing rails:
      ERROR: Failed to build gem native extension.


Any ideas what I am doing wrong, or what I can do to upgrade to rails?

Ruby Version is:1.8.7, patchlevel 174
Rails current version is: 2.3.5

Many thanks in advance..

===
Here is the full output when running..

iMac:blog jason$ sudo gem update rails -y

Updating installed gems
Updating rails
Fetching: activesupport-3.1.0.gem (100%)
Fetching: builder-3.0.0.gem (100%)
Fetching: i18n-0.6.0.gem (100%)
Fetching: bcrypt-ruby-3.0.0.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing rails:
	ERROR: Failed to build gem native extension.

        /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/
ruby extconf.rb
mkmf.rb can''t find header files for ruby at /System/Library/Frameworks/
Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h


Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/bcrypt-
ruby-3.0.0 for inspection.
Results logged to /Library/Ruby/Gems/1.8/gems/bcrypt-ruby-3.0.0/ext/
mri/gem_make.out
Gems updated: multi_json, activesupport, builder, i18n
Installing ri documentation for multi_json-1.0.3...
Installing ri documentation for activesupport-3.1.0...
Installing ri documentation for builder-3.0.0...
Installing ri documentation for i18n-0.6.0...
Installing RDoc documentation for multi_json-1.0.3...
Installing RDoc documentation for activesupport-3.1.0...
Installing RDoc documentation for builder-3.0.0...
Installing RDoc documentation for i18n-0.6.0...

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Quoting jay@oz
<jason.morris.email-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
> I am new to Rails and attempting to upgrade Rails on my Mac to latest
> version so that I can follow the rails tutorial, but I just can''t
seem
> to get anywhere.
> 
> When I attempt to update rails with: $ sudo gem update rails -y, I
> receive the following error.
> 
> ERROR:  Error installing rails:
>       ERROR: Failed to build gem native extension.
> 
> 
> Any ideas what I am doing wrong, or what I can do to upgrade to rails?
> 
> Ruby Version is:1.8.7, patchlevel 174
> Rails current version is: 2.3.5
> 
> Many thanks in advance..
> 
> ===> 
> Here is the full output when running..
> 
> iMac:blog jason$ sudo gem update rails -y
> 
> Updating installed gems
> Updating rails
> Fetching: activesupport-3.1.0.gem (100%)
> Fetching: builder-3.0.0.gem (100%)
> Fetching: i18n-0.6.0.gem (100%)
> Fetching: bcrypt-ruby-3.0.0.gem (100%)
> Building native extensions.  This could take a while...
> ERROR:  Error installing rails:
> 	ERROR: Failed to build gem native extension.
> 
>         /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/
> ruby extconf.rb
> mkmf.rb can''t find header files for ruby at
/System/Library/Frameworks/
> Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h
> 
This is the key.  Look for ruby.h somewhere else on your system or install a
package named ruby-dev or ruby-devel.  I don''t know Macs, so the exact
name
may vary.  The Ruby package includes just the ruby libraries and executables.
Ruby-dev includes header files and other files needed to compile and build
Ruby and Ruby native extensions.

HTH,
  Jeffrey

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Thanks Jeffrey, I tried google both ruby-dev and ruby-devel, but
couldn''t find anything..

I do have a file osx_ruby.h.... is this what you mean?  What should I
do with it?

Is it seriously this hard to upgrade rails?  I''ve been a CF developer
for years, and have been keen to give rails a try, but to be honest,
this is all starting to remind me of the bad old days of .jsp..

Thanks again Jeffrey..



On Sep 6, 1:22 am, "Jeffrey L. Taylor"
<r...-f/t7CGFWhwGcvWdFBKKxig@public.gmane.org>
wrote:
> Quoting jay@oz
<jason.morris.em...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>
>
>
>
>
>
>
>
>
> > I am new to Rails and attempting to upgrade Rails on my Mac to latest
> > version so that I can follow the rails tutorial, but I just
can''t seem
> > to get anywhere.
>
> > When I attempt to update rails with: $ sudo gem update rails -y, I
> > receive the following error.
>
> > ERROR:  Error installing rails:
> >       ERROR: Failed to build gem native extension.
>
> > Any ideas what I am doing wrong, or what I can do to upgrade to rails?
>
> > Ruby Version is:1.8.7, patchlevel 174
> > Rails current version is: 2.3.5
>
> > Many thanks in advance..
>
> > ===>
> > Here is the full output when running..
>
> > iMac:blog jason$ sudo gem update rails -y
>
> > Updating installed gems
> > Updating rails
> > Fetching: activesupport-3.1.0.gem (100%)
> > Fetching: builder-3.0.0.gem (100%)
> > Fetching: i18n-0.6.0.gem (100%)
> > Fetching: bcrypt-ruby-3.0.0.gem (100%)
> > Building native extensions.  This could take a while...
> > ERROR:  Error installing rails:
> >    ERROR: Failed to build gem native extension.
>
> >        
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/
> > ruby extconf.rb
> > mkmf.rb can''t find header files for ruby at
/System/Library/Frameworks/
> > Ruby.framework/Versions/1.8/usr/lib/ruby/ruby.h
>
> This is the key.  Look for ruby.h somewhere else on your system or install
a
> package named ruby-dev or ruby-devel.  I don''t know Macs, so the
exact name
> may vary.  The Ruby package includes just the ruby libraries and
executables.
> Ruby-dev includes header files and other files needed to compile and build
> Ruby and Ruby native extensions.
>
> HTH,
>   Jeffrey
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