我安装失败gem rmagick，因为我的 OS X 中已经安装了 ImageMagick。如何删除 ImageMagick？我找不到它是由 MacPorts 或 Homebrew 安装的。我不记得我是如何安装它的。有关信息，当我运行时convert --version，我得到：
Version: ImageMagick 6.7.6-9 2012-05-12
当我跑sudo find . -name "ImageMagick*"进去时/，我得到
./usr/local/etc/ImageMagick
./usr/local/include/ImageMagick
./usr/local/include/ImageMagick/magick/ImageMagick.h
./usr/local/lib/ImageMagick-6.7.6
./usr/local/lib/ImageMagick-6.8.0
./opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/graphics/ImageMagick
当我跑步时mdfind MagickWand.h
/usr/local/share/doc/ImageMagick-6.8.0/www/api/MagickWand/struct__MagickWand.html
/usr/local/include/ImageMagick/wand/MagickWand.h
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports.tar
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/php/php5-magickwand/Portfile
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/php/php5-magickwand/files/patch-magickwand.h.diff
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/php/php5-imagick/files/patch-config.m4.diff
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/php/php-magickwand/Portfile
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/php/php-magickwand/files/patch-magickwand.h.diff
/opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/php/php-imagick/files/patch-config.m4.diff