The problem is in the currently latest version of mini_magick (3.6.0) gem. 
See the issue here:
https://github.com/minimagick/minimagick/issues/145

To install Watir now, install previous version of mini_magick first and 
then watir:
gem install mini_magick -v 3.5.0
gem install watir

Jarmo Pertman
-----
IT does really matter - http://itreallymatters.net

On Friday, September 13, 2013 2:21:11 AM UTC+3, [email protected] wrote:
>
> I had the following error message occur after attempting the latest Watir 
> installation.  PLEASE HELP!
>
> /Error during installation of Watir//
>
> 1.  Installed Ruby:Ruby 2.0.0-p247 (successful install)
> 2.  Installed devkit:  DevKit-mingw64-32-4.7.2-20130224-1151-sfx.exe 
> (successful install and
> initialization) (Ruby 2.0.0: mingw64-32-4.7.2)
> 3.  Attempted to Install Watir using command:  gem install watir --no-ri 
> --no-rdoc.
>
> RECEIVED ERROR MESSAGE DURING Watir install:
>
> *While executing gem ... <Errno::EINVAL>*
> *   Invalid argument - 
> C:/Ruby200/lib/ruby/gems/2.0.0/gems/mini_magick-3.6.0/test/*
> *   files/special! "chars'.gif*
>
> System Details of machine trying to install on:
>
> OS Name Microsoft Windows XP Home Edition
> Version 5.1.2600 Service Pack 3 Build 2600
> OS Manufacturer Microsoft Corporation
> System Model Inspiron 6000
> System Type X86-based PC
> Processor x86 Family 6 Model 13 Stepping 6 GenuineIntel ~1296 Mhz
> BIOS Version/Date Dell Inc. A09, 9/28/2005
> SMBIOS Version 2.3
> Windows Directory C:\WINDOWS
> System Directory C:\WINDOWS\system32
> Boot Device \Device\HarddiskVolume1
> Locale United States
> Hardware Abstraction Layer Version = "5.1.2600.5512 (xpsp.080413-2111)"
> User Name SARA-7F35E82C65\Sara
> Time Zone Central Daylight Time
> Total Physical Memory 1,024.00 MB
> Available Physical Memory 380.94 MB
> Total Virtual Memory 2.00 GB
> Available Virtual Memory 1.96 GB
> Page File Space 2.39 GB
> Page File C:\pagefile.sys
>
>

-- 
-- 
Before posting, please read http://watir.com/support. In short: search before 
you ask, be nice.

[email protected]
http://groups.google.com/group/watir-general
[email protected]

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