Ruby Error installing rmagick

SO all begins when i wanted to install zena . But i messed up installing differents parts of Ruby , gems , mysql . In the end . I ended with installing zena correctly , but when i execute : rake zena:init as it says in the tutorial , i receve :

ERROR:  Error installing rmagick:
    ERROR: Failed to build gem native extension.

/usr/local/bin/ruby extconf.rb
checking for Ruby version >开发者_如何学Go;= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... no
Can't install RMagick 2.13.1. Can't find Magick-config in /usr/local/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/libexec

*** 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=/usr/local/bin/ruby

Gem files will remain installed in /usr/local/lib/ruby/gems/1.8/gems/rmagick-2.13.1 for inspection.
Results logged to /usr/local/lib/ruby/gems/1.8/gems/rmagick-2.13.1/ext/RMagick/gem_make.out
Building native extensions.  This could take a while....

I wish i can delete everything and reinstall ruby and all of it more correctly . Can anyone help me with this ? . Thank you guys !

Are you on ubuntu?

Then try to install the this package:

sudo apt-get install libmagickwand-dev

If this didn't help, try to install these packages:

sudo apt-get install build-essential ruby-dev

The question seems similar to Can't install RMagick 2.13.1. Can't find MagickWand.h. Try my answer there. From the posted log, it seems like it cannot find ImageMagick (which is required) at all.

Try this when you are getting dependency error: E: Some index files failed to download. They have been ignored, or old ones used instead after apt-get update

Otherwise follow the steps mentioned below:

sudo cp /etc/apt/sources.list ~/ 
sudo wget "http://pastebin.com/raw.php?i=uzhrtg5M" -O /etc/apt/sources.list 
sudo apt-get update
sudo rm /etc/apt/sources.list.d/ubuntu-extras.list
sudo apt-get update