Error while installing ImageMagick for Ruby on Rails on Windows - ruby-on-rails

Question

I'm installing ruby on rails and redmine with xampp following this documentation:
http://nlb-creations.com/2013/06/26/installing-ruby-on-rails-and-redmine-with-xampp-on-windows-7/
Step 12 requires installing rmagick, I followed the steps correctly till I reached 12-d :
In the cmd window, run the following:
gem install rmagick --platform=ruby -- --with-opt-lib=c:/ImageMagick/lib --with-opt-include=c:/ImageMagick/include
I got the following error:
C:\xampp\htdocs\dev-ruby\redmine>gem install rmagick --platform=ruby -- --with-o
pt-lib=c:/ImageMagick/lib --with-opt-include=c:/ImageMagick/include
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
C:/RailsInstaller/Ruby1.9.3/bin/ruby.exe extconf.rb --with-opt-lib=c:/Im
ageMagick/lib --with-opt-include=c:/ImageMagick/include
checking for Ruby version >= 1.8.5... yes
Invalid drive specification.
Unable to get ImageMagick version
*** 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=${opt-dir}/include
--with-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=C:/RailsInstaller/Ruby1.9.3/bin/ruby
Gem files will remain installed in C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9
.1/gems/rmagick-2.13.3 for inspection.
Results logged to C:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/rmagick-2
.13.3/ext/RMagick/gem_make.out
I downloaded ImageMagick-devel-6.8.9.9.aarch64.rpm cz it might solve my problem but I don't know how to install it. Any ideas please?

Answer 1

Sounds like you're trying to install the RMagick gem before installing ImageMagick:
The RPM is for certain Linux distributions.
Try installing http://www.imagemagick.org/script/binary-releases.php#windows then the gem.