Q:

RMagick build on Windows fails

I am trying to build gem install the rmagick gem on a Windows 8.1 machine with railsinstaller installed. I followed this guide: Ruby 1.9.2 how to install RMagick on Windows? 
On the step 4 gem install I get an error (as it seems compiling works and there's something wrong when linking): 
compiling rmutil.c
linking shared-object RMagick2.so
rmagick.o: In function `Magick_colors':
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\rmagick-2.13.2\ext\RMagick/rmagick.c:40: undefined reference to `GetExceptionInfo'
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\rmagick-2.13.2\ext\RMagick/rmagick.c:42: undefined reference to `GetColorInfoList'
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\rmagick-2.13.2\ext\RMagick/rmagick.c:44: undefined reference to `DestroyExceptionInfo'
rmagick.o: In function `Magick_fonts':
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\rmagick-2.13.2\ext\RMagick/rmagick.c:89: undefined reference to `GetExceptionInfo'
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\rmagick-2.13.2\ext\RMagick/rmagick.c:90: undefined reference to `GetTypeInfoList'
C:\RailsInstaller\Ruby1.9.3\lib\ruby\gems\1.9.1\gems\rmagick-2.13.2\ext\RMagick/rmagick.c:92: undefined reference to `DestroyExceptionInfo'
rmagick.o: In function `Magick_init_formats':

And so on for many (I assume all) magick functions.
Any Idea how to solve this?

A:

I had to use the 32bit installation instead of the 64bit. Thanks to the good folks of Rubyinstaller at Google Groups to point me in the right direction.

