# Gem install mongrel problem

**URL:** <https://www.ruby-forum.com/t/gem-install-mongrel-problem/111801>\
**Category:** Rails\
**Created:** [August 11, 2007, 12:09am UTC](https://www.ruby-forum.com/t/gem-install-mongrel-problem/111801 "2007-08-11T00:09:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tiggyboo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/b782af/32.png) [@tiggyboo](https://www.ruby-forum.com/u/tiggyboo)\
**Post date:** [August 11, 2007, 12:09am UTC](https://www.ruby-forum.com/t/gem-install-mongrel-problem/111801/1 "2007-08-11T00:09:43Z")

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The following is my attempt to install mongrel on ruby 1.8.5 - any  
suggestions? thanks in advance - Al

* * *

[root@pmd1vm01 rubytest]# gem install mongrel

Bulk updating Gem source index for: [http://gems.rubyforge.org](http://gems.rubyforge.org)  
Select which gem to install for your platform (i386-linux)

1. mongrel 1.0.1 (mswin32)
2. mongrel 1.0.1 (ruby)
3. mongrel 1.0 (mswin32)
4. mongrel 1.0 (ruby)
5. Skip this gem
6. Cancel installation

> 2  
> Install required dependency fastthread? [Yn] Y  
> Select which gem to install for your platform (i386-linux)

1. fastthread 1.0 (ruby)
2. fastthread 1.0 (mswin32)
3. fastthread 0.6.4.1 (mswin32)
4. fastthread 0.6.4.1 (ruby)
5. Skip this gem
6. Cancel installation

> 1  
> 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 mongrel  
can’t find header files for ruby.

Gem files will remain installed in /usr/lib/ruby/gems/1.8/gems/  
fastthread-1.0 for inspection.  
Results logged to /usr/lib/ruby/gems/1.8/gems/fastthread-1.0/ext/  
fastthread/gem\_make.out

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<div class="post-metadata">

**Author:** ![tiggyboo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/b782af/32.png) [@tiggyboo](https://www.ruby-forum.com/u/tiggyboo)\
**Post date:** [August 11, 2007, 12:29am UTC](https://www.ruby-forum.com/t/gem-install-mongrel-problem/111801/2 "2007-08-11T00:29:48Z")

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You must install ruby-dev library in yours OS

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<div class="post-metadata">

**Author:** ![tiggyboo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/b782af/32.png) [@tiggyboo](https://www.ruby-forum.com/u/tiggyboo)\
**Post date:** [August 11, 2007, 6:01pm UTC](https://www.ruby-forum.com/t/gem-install-mongrel-problem/111801/3 "2007-08-11T18:01:07Z")

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Thanks - is there a gem for ruby-dev… I’m not able to find one at  
rubyforge…

On Aug 10, 5:29 pm, Klodus K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

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**Author:** ![tiggyboo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/b782af/32.png) [@tiggyboo](https://www.ruby-forum.com/u/tiggyboo)\
**Post date:** [August 11, 2007, 6:38pm UTC](https://www.ruby-forum.com/t/gem-install-mongrel-problem/111801/4 "2007-08-11T18:38:11Z")

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Nevermind, found it:

yum install ruby-devel.i386

Looks like mongrel is running now, thanks (now I’m free to work the  
multiple remaining issues 🙂  
Thanks,  
Al

On Aug 10, 5:29 pm, Klodus K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)