Unable to install rmagick on mojave - ruby

Question

Went thru many blogs in stackoverflow inorder to install rmagick but didnt find a solution. Any help is much appreciated.
Tried using uninstalling and reinstalling imagemagick. Flow some links like Install rmagick
Here is the output
sudo gem install rmagick
Building native extensions. This could take a while...
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
current directory: /Library/Ruby/Gems/2.3.0/gems/rmagick-
2.16.0/ext/RMagick
/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby -r
./siteconf20181206-50407-46eq96.rb extconf.rb
checking for xcrun... yes
checking for Magick-config... yes
checking for outdated ImageMagick version (<= 6.4.9)... no
checking for presence of MagickWand API (ImageMagick version >=
6.9.0)... no
*** 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=/System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/$(RUBY_BASE_NAME)
extconf.rb:104:in ``': No such file or directory - MagickWand-config
(Errno::ENOENT)
from extconf.rb:104:in `configure_compile_options'
from extconf.rb:16:in `initialize'
from extconf.rb:548:in `new'
from extconf.rb:548:in `<main>'
To see why this extension failed to compile, please check the mkmf.log
which can be found here:
/Library/Ruby/Gems/2.3.0/extensions/universal-darwin-18/2.3.0/rmagick-2.16.0/mkmf.log
extconf failed, exit code 1
Gem files will remain installed in
/Library/Ruby/Gems/2.3.0/gems/rmagick-2.16.0 for inspection.
Results logged to /Library/Ruby/Gems/2.3.0/extensions/universal-
darwin-18/2.3.0/rmagick-2.16.0/gem_make.out

Answer 1

If you've installed Imagemagick per the instructions in your link, your shell may missing the path to the binaries. You can test by running a console command:
which MagickWand-config
If it returns a path (likely /usr/local/bin/MagickWand-config) your path is probably fine. If it returns MagickWand-config not found you should be able to type export PATH=/usr/local/bin:$PATH in your console.
If your path wasn't correct before, after running the export command you can re-run the which MagickWand-config command to confirm it's in your path. Then try to gem install rmagick again.
I was able to install rmagick on Mojave following the link you posted.
If this did fix your issue you'll also want to add the export command I noted in your ~/.bash_profile or ~/.zsh_profile file so that path is prepended in every terminal window (if it's not there already)