Ubuntu14.04にNokogiriを導入するERROR: Error installing nokogiri: ERROR: Failed to build gem native extension. /usr/bin/ruby2.1 extconf.rb checking if the C compiler accepts ... yes Building nokogiri using packaged libraries. checking for gzdopen() in -lz... no zlib is missing; necessary for building libxml2 *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or header
