From: Peter Vandenabeele <peter@...>
Date: 2012-01-11T00:16:37+09:00
Subject: Re: ruby image manipulation

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On Tue, Jan 10, 2012 at 2:55 PM, Daniel Stephens <danny.a.stephens@gmail.com
> wrote:

> Hey everyone,
>
>  Just curious if anyone has had any luck installing ImageMagick-6.7.4-Q16
> and rmagick-2.13.x. I have been trying to follow a few posts out here, but
> no luck. I can obviously get ImageMagick in stalled, but when I try to
> install the gem rmagick(gem install rmagick) It's like it's trying to build
> the gem.
>

*TL;DR* : $ sudo apt-get install libmagickcore-dev libmagickwand-dev
**
Yes, it is trying to build "native extensions".

Assuming you saw this error:

<quote>
 ~/data/projects/temp/rmagick$ bundle install
Fetching source index for http://rubygems.org/
Installing rmagick (2.13.1) with native extensions
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native
extension.

        /home/peterv/.rvm/rubies/ruby-1.9.3-p0/bin/ruby extconf.rb
checking for Ruby version >= 1.8.5... yes
extconf.rb:128: Use RbConfig instead of obsolete and deprecated Config.
checking for gcc... yes
checking for Magick-config... no
Can't install RMagick 2.13.1. Can't find Magick-config in
/home/peterv/.rvm/gems/ruby-1.9.3-p0@rmagick
/bin:/home/peterv/.rvm/gems/ruby-1.9.3-p0@global
/bin:/home/peterv/.rvm/rubies/ruby-1.9.3-p0/bin:/home/peterv/.rvm/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

Provided configuration options:
    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --without-make-prog
    --srcdir=.
    --curdir
    --ruby=/home/peterv/.rvm/rubies/ruby-1.9.3-p0/bin/ruby


Gem files will remain installed in
/home/peterv/.rvm/gems/ruby-1.9.3-p0@rmagick/gems/rmagick-2.13.1 for
inspection.
Results logged to /home/peterv/.rvm/gems/ruby-1.9.3-p0@rmagick
/gems/rmagick-2.13.1/ext/RMagick/gem_make.out
An error occured while installing rmagick (2.13.1), and Bundler cannot
continue.
Make sure that `gem install rmagick -v '2.13.1'` succeeds before bundling.
</quote>

I used the regular trick to find the required debian/Ubuntu packages:


~/data/projects/temp/rmagick$ apt-cache search magick | grep '\-dev'
libmagick++-dev - object-oriented C++ interface to ImageMagick -
development files
libmagickcore-dev - low-level image manipulation library - development files
libmagickwand-dev - image manipulation library - development files
graphicsmagick-libmagick-dev-compat - image processing libraries providing
ImageMagick interface
libgraphicsmagick++1-dev - format-independent image processing - C++
development files
libgraphicsmagick1-dev - format-independent image processing - C
development files
libvips-dev - image processing system good for very large images (dev)

Installed
~/data/projects/temp/rmagick$ sudo apt-get install libmagickcore-dev
# this pulls in 80+ packages .. probably a smaller set would suffice ...

~/data/projects/temp/rmagick$ sudo apt-get install libmagickwand-dev
# this was only 1 package

And now gem install or bundle install works:

~/data/projects/temp/rmagick$ bundle install
Fetching source index for http://rubygems.org/
Installing rmagick (2.13.1) with native extensions
Using bundler (1.0.21)


HTH,

Peter

-- 
Peter Vandenabeele
http://twitter.com/peter_v
http://rails.vandenabeele.com

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