我已经安装了以下内容：
但我仍然收到此错误。
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Mon 05Oct09 19:36:06
This installation of RMagick 2.12.0 is configured for
Ruby 1.8.7 (i486-linux) and ImageMagick 6.4.5 Q16
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make
cc -I. -I. -I/usr/lib/ruby/1.8/i486-linux -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/usr/include/ImageMagick -fPIC -I/usr/include/ImageMagick -fopenmp -c rmmontage.c
cc -I. -I. -I/usr/lib/ruby/1.8/i486-linux -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/usr/include/ImageMagick -fPIC -I/usr/include/ImageMagick -fopenmp -c rmutil.c
cc -I. -I. -I/usr/lib/ruby/1.8/i486-linux -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/usr/include/ImageMagick -fPIC -I/usr/include/ImageMagick -fopenmp -c rmmain.c
cc -I. -I. -I/usr/lib/ruby/1.8/i486-linux -I. -DRUBY_EXTCONF_H=\"extconf.h\" -I/usr/include/ImageMagick -fPIC -I/usr/include/ImageMagick -fopenmp -c rmimage.c
rmimage.c: In function ‘Image_function_channel’:
rmimage.c:5136: error: ‘MagickFunction’ undeclared (first use in this function)
rmimage.c:5136: error: (Each undeclared identifier is reported only once
rmimage.c:5136: error: for each function it appears in.)
rmimage.c:5136: error: expected ‘;’ before ‘function’
rmimage.c:5152: error: ‘function’ undeclared (first use in this function)
rmimage.c:5158: error: ‘PolynomialFunction’ undeclared (first use in this function)
rmimage.c:5164: error: ‘SinusoidFunction’ undeclared (first use in this function)
make: *** [rmimage.o] Error 1
答案 0 :(得分：1)
看起来2.12.1刚刚发布，我刚刚在我的ubuntu机器上进行了测试，它似乎安装得很好。
答案 1 :(得分：0)
也许尝试使用ImageMagick 6.5.6，因为这是最新的
答案 2 :(得分：0)
gem install rmagick -v '2.12.1'
版本：
Version: ImageMagick 6.3.7 08/07/09 Q16
在Debian Lenny上取得了成功