error installing in fedora 27

[aoyawale]

when I try gem install catpix

I get this errors:

gem install catpix                                                                                              2 ↵  6529  13:28:51 
Building native extensions.  This could take a while...
ERROR:  Error installing catpix:
	ERROR: Failed to build gem native extension.

    current directory: /home/jlozadad/.gem/ruby/gems/rmagick-2.16.0/ext/RMagick
/usr/bin/ruby -r ./siteconf20180820-16460-qlq0i5.rb extconf.rb
checking for gcc... yes
checking for Magick-config... no
checking for pkg-config... yes
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
to the PKG_CONFIG_PATH environment variable
Package 'MagickCore', required by 'virtual:world', not found
checking for outdated ImageMagick version (<= 6.4.9)... *** 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}/lib64
	--with-make-prog
	--without-make-prog
	--srcdir=.
	--curdir
	--ruby=/usr/bin/$(RUBY_BASE_NAME)

To see why this extension failed to compile, please check the mkmf.log which can be found here:

  /home/jlozadad/.gem/ruby/extensions/x86_64-linux/2.4.0/rmagick-2.16.0/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /home/jlozadad/.gem/ruby/gems/rmagick-2.16.0 for inspection.
Results logged to /home/jlozadad/.gem/ruby/extensions/x86_64-linux/2.4.0/rmagick-2.16.0/gem_make.out

I check the log file:

find_executable: checking for gcc... -------------------- yes

--------------------

find_executable: checking for Magick-config... -------------------- no

--------------------

find_executable: checking for pkg-config... -------------------- yes

--------------------

Detected ImageMagick version: 
Can't install RMagick 2.16.0. You must have ImageMagick 6.4.9 or later.
Can't install RMagick 2.16.0. You must have ImageMagick 6.4.9 or later.

but, I have imagemagick installed

sudo dnf install ImageMagick                                                                                    1 ↵  6527  13:28:25 
Failed to synchronize cache for repo 'ippytraxx-gnome-twitch', disabling.
Last metadata expiration check: 0:00:09 ago on Mon 20 Aug 2018 01:28:25 PM EDT.
Package ImageMagick-1:6.9.9.38-1.fc27.x86_64 is already installed, skipping.
Dependencies resolved.
Nothing to do.
Complete!

[paulgoetze]

I had a similar problem (on Ubuntu, though). I needed to install the dev libs as well. Installing the Gem worked for me after running:

sudo apt install imagemagick libmagickwand-dev

[r33fyello]

Same on osx with : gem install catpix