ERROR: Error installing rmagick: ERROR: Failed to build gem native extension. /Users/user/.rbenv/versions/2.1.1/bin/ruby extconf.rb checking for Ruby version >= 1.8.5... yes checking for clang... yes checking for Magick-config... yes checking for ImageMagick version >= 6.4.9... yes checking for HDRI disabled version of ImageMagick... yes /usr/local/bin/Magick-config: line 41: pkg-config: command n