# Cannot install eventmachine

**URL:** <https://www.ruby-forum.com/t/cannot-install-eventmachine/129279>\
**Category:** Ruby\
**Created:** [February 16, 2008, 2:20am UTC](https://www.ruby-forum.com/t/cannot-install-eventmachine/129279 "2008-02-16T02:20:54Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Junkone](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e274bd/32.png) [@Junkone](https://www.ruby-forum.com/u/Junkone)\
**Post date:** [February 16, 2008, 2:20am UTC](https://www.ruby-forum.com/t/cannot-install-eventmachine/129279/1 "2008-02-16T02:20:54Z")

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i cannot install event machine. i get error. i tried all the options.

E:\Documents and Settings\Trade\>gem install eventmachine  
Select which gem to install for your platform (i386-mswin32)

1. eventmachine 0.10.0 (ruby)
2. eventmachine 0.9.0 (ruby)
3. eventmachine 0.8.1 (i386-mswin32)
4. eventmachine 0.8.1 (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 eventmachine  
checking for windows.h… no  
\*\*\* extconf.rb failed \*\*\*  
Could not create Makefile due to some reason, probably lack of  
necessary libraries and/or headers. Check the mkmf.log file for more  
details. You may need configuration options.

Provided configuration options:  
–with-opt-dir  
–without-opt-dir  
–with-opt-include  
–without-opt-include=${opt-dir}/include  
–with-opt-lib  
–without-opt-lib=${opt-dir}/lib  
–with-make-prog  
–srcdir=.  
–curdir  
–ruby=e:/ruby/bin/ruby

Gem files will remain installed in e:/ruby/lib/ruby/gems/1.8/gems/  
eventmachine-0.10.0 for inspection.  
Results logged to e:/ruby/lib/ruby/gems/1.8/gems/eventmachine-0.10.0/  
ext/gem\_make.out

---

<div class="post-metadata">

**Author:** ![Junkone](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e274bd/32.png) [@Junkone](https://www.ruby-forum.com/u/Junkone)\
**Post date:** [February 16, 2008, 2:26am UTC](https://www.ruby-forum.com/t/cannot-install-eventmachine/129279/2 "2008-02-16T02:26:10Z")

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From: “Junkone” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

> 1. 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 eventmachine  
> checking for windows.h… no  
> \*\*\* extconf.rb failed \*\*\*

What happens when you try #3 ?

Regards,

Bill

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<div class="post-metadata">

**Author:** ![Junkone](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/e274bd/32.png) [@Junkone](https://www.ruby-forum.com/u/Junkone)\
**Post date:** [February 16, 2008, 2:55am UTC](https://www.ruby-forum.com/t/cannot-install-eventmachine/129279/3 "2008-02-16T02:55:26Z")

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On 15 feb, 23:16, Junkone [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> ```
> --ruby=e:/ruby/bin/ruby
> 
> ```
> 
> Gem files will remain installed in e:/ruby/lib/ruby/gems/1.8/gems/  
> eventmachine-0.10.0 for inspection.  
> Results logged to e:/ruby/lib/ruby/gems/1.8/gems/eventmachine-0.10.0/  
> ext/gem\_make.out

You need a compiler to build native extensions. more precisely, you  
need VC6 to build Ruby C extensions like eventmachine.

I’ll suggest you ask the gem maintainers for updates of version 0.10.

Regards,