how do you get rmagick to work on windows 7 64-bit with rails 3.1 and carrierwave?

I'm having trouble getting rmagick to work on windows. Does anyone know how to get this working correctly? And even better, hopefully in 开发者_运维知识库a way that is compatible with a production environment, although I'll take whatever I can get.

C:\> gem install rmagick --platform=ruby -- --with-opt-lib=%IMAGE_MAGICK_HOME%/lib --with-opt-include=%IMAGE_MAGICK_HOME%/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:/ruby192/bin/ruby.exe extconf.rb --with-opt-lib=C:\Program Files (x86)\ImageMagick-6.7.0-Q16/lib --with-opt-include=C:\Program Fil
es (x86)\ImageMagick-6.7.0-Q16/include
checking for Ruby version >= 1.8.5... yes
checking for stdint.h... *** 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:/ruby192/bin/ruby
c:/ruby192/lib/ruby/1.9.1/mkmf.rb:368:in `try_do': The complier failed to generate an executable file. (RuntimeError)
You have to install development tools first.
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:452:in `try_cpp'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:834:in `block in have_header'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:693:in `block in checking_for'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:280:in `block (2 levels) in postpone'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:254:in `open'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:280:in `block in postpone'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:254:in `open'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:276:in `postpone'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:692:in `checking_for'
        from c:/ruby192/lib/ruby/1.9.1/mkmf.rb:833:in `have_header'
        from extconf.rb:193:in `<main>'


Gem files will remain installed in c:/ruby192/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1 for inspection.
Results logged to c:/ruby192/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/ext/RMagick/gem_make.out

Answer in this thread made it work on both of my computer: RMagick on Windows

I hope it'll work for you too !

For future reference: I just installed rmagick into Ruby 2.1-x64 on Windows using instructions from a reddit post, reposted below:

Download the Ruby Development Kit from http://rubyinstaller.org/downloads/ and unpack it somewhere. (By the way, your Ruby must also have come from Rubyinstaller otherwise the dev kit says it won't work.)

Init your DevKit by doing

dk.rb init

this will create a config.yml with a list of Rubies found on your system, you may edit it and delete the ones you don't care about

dk.rb review

to make sure the previous step went well

dk.rb install

to install DevKit into that Ruby, after this is done you'll be able to compile native Ruby extensions.

Download ImageMagick from Link (ImageMagick-6.9.2-3-Q16-x64-dll.exe worked for me), and install it to a path without spaces. Make sure to check Add application directory to system path and Install headers and libraries for C and C++.

Restart your command line window to make sure the change to PATH took.

Do a quick set PATH to make sure ImageMagick is first in PATH, otherwise the install will fail (because an install script calls convert.exe which is from ImageMagick, but there also exists a C:\Windows\system32\convert.exe).

Run the following line, suitably replacing with the location of ImageMagick on your system (which, you remember, should not contain spaces):

gem install rmagick --platform=ruby -- --with-opt-lib=D:/Tools/ImageMagick-6.9.2-Q16/lib --with-opt-include=D:/Tools/ImageMagick-6.9.2-Q16/include --with-opt-dir=D:/Tools/ImageMagick-6.9.2-Q16

It should churn for a couple of minutes and then you're golden.

By the way, as long as you intend to be using RMagick, you're stuck with having ImageMagick in your PATH.