Package MagickCore was not found in the pkg-config search path [closed]

I was trying to install rmagick and it always asks for PKG_CONFIG_PATH not configured. This happened multiple times to me, so I'm posting this as an issue and answering myself for anyone else facing same issue. User-MacBook-Pro:rsscom macuser$ gem install rmagick -v '2.13.3' Building native extensions. This could take a while... ERROR: Error installing rmagick: ERROR: Failed to build gem native extension. /Users/macuser/.rvm/rubies/ruby-2.2.0/bin/ruby -r ./siteconf20160705-63310-klqxmw.rb extconf.rb checking for Ruby version >= 1.8.5... yes checking for gcc... yes checking for Magick-config... yes checking for ImageMagick version >= 6.4.9... 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 No package 'MagickCore' found 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 No package 'MagickCore' found 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 No package 'MagickCore' found 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 No package 'MagickCore' found checking for stdint.h... yes checking for sys/types.h... yes checking for wand/MagickWand.h... no Can't install RMagick 0.0.0. Can't find MagickWand.h. *** 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=/Users/macuser/.rvm/rubies/ruby-2.2.0/bin/$(RUBY_BASE_NAME) extconf failed, exit code 1 Gem files will remain installed in /Users/macuser/.rvm/gems/ruby-2.2.0/gems/rmagick-2.13.3 for inspection. Results logged to /Users/macuser/.rvm/gems/ruby-2.2.0/extensions/x86_64-darwin-14/2.2.0-static/rmagick-2.13.3/gem_make.out