A lot of people are looking for an updated installation of ImageMagick instead of those pesky yum packages on Redhat or CentOS. To upgrade to the last version, use these commands :
# uninstall old ImageMagick
yum remove ImageMagick
# get new ImageMagick sources
wget ftp://ftp.imagemagick.org/pub/ImageMagick/ImageMagick.tar.gz
# untar
tar -zxvf ImageMagick*.tar.gz
cd ImageMagick*
# configure and make
./configure
make
# install
make install
# test ImageMagick (shouldn’t report an error)
convert logo: logo.gif
# fix problem with rmagick not finding ImageMagick libraries
echo /usr/local/lib >> /etc/ld.so.conf.d/ImageMagick.conf
ldconfig
# update rmagick
gem install rmagick
I found this at https://support.railsmachine.com/index.php?pg=kb.page&id=133
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