How to install Nokogiri Ruby gem with mkmf.log saying libiconv not found?

Question

I\'m installing the Ruby Nokogiri gem and finding the error below.

How to diagnose this and solve it?

# gem install nokogiri
Building native extensio         


        

Answer 1

Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers.

You are probably missing zlib headers which are required for -lz flag in order to compile the sources correctly. Install on Linux by:

sudo apt-get install libz-dev

For missing libiconv, try installing libiconv-hook-dev package which has header files of libiconv-hook, e.g.

sudo apt-get install libiconv-hook1 libiconv-hook-dev

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On OS X, try installing development tools via: xcode-select --install.

If there is still problem, check mkmf.log file for more specific details about your error.

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On Ubuntu, try the following dependency fix combo:

sudo apt-get install gcc ruby-dev libxslt-dev libxml2-dev zlib1g-dev