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I followed the instructions for installing rmagick, but the process ended with errors:

======================================================================
Sat 15Dec12 17:30:32
This installation of RMagick 2.13.1 is configured for
Ruby 1.9.3 (i386-mingw32) and ImageMagick 6.8.0
======================================================================

make
generating RMagick2-i386-mingw32.def
compiling rmagick.c
In file included from C:\Program Files (x86)\ImageMagick-6.8.0-Q16\include/magick/magick-config.h:25:0,
                 from C:\Program Files (x86)\ImageMagick-6.8.0-Q16\include/magick/MagickCore.h:29,
                 from rmagick.h:47,
                 from rmagick.c:13:
C:\Program Files (x86)\ImageMagick-6.8.0-Q16\include/magick/magick-baseconfig.h:181:14: error: conflicting types for 'ss
ize_t'
d:\apps\devkit\mingw\bin\../lib/gcc/mingw32/4.5.2/../../../../include/sys/types.h:118:18: note: previous declaration of
'ssize_t' was here
rmagick.c: In function 'Magick_colors':
rmagick.c:42:5: warning: passing argument 2 of 'GetColorInfoList' from incompatible pointer type
C:\Program Files (x86)\ImageMagick-6.8.0-Q16\include/magick/color.h:75:5: note: expected 'size_t *' but argument is of t
ype 'long unsigned int *'
rmagick.c: In function 'Magick_fonts':
rmagick.c:90:5: warning: passing argument 2 of 'GetTypeInfoList' from incompatible pointer type
C:\Program Files (x86)\ImageMagick-6.8.0-Q16\include/magick/type.h:98:5: note: expected 'size_t *' but argument is of ty
pe 'long unsigned int *'
rmagick.c: In function 'Magick_init_formats':
rmagick.c:178:5: warning: passing argument 2 of 'GetMagickInfoList' from incompatible pointer type
C:\Program Files (x86)\ImageMagick-6.8.0-Q16\include/magick/magick.h:125:5: note: expected 'size_t *' but argument is of
 type 'long unsigned int *'
make: *** [rmagick.o] Error 1

Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1 for inspection.
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/rmagick-2.13.1/ext/RMagick/gem_make.out

D:\apps>