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I encountered a problem while installing a required gem. The error, in short, displayed:

ERROR: Failed to build gem native extension.

/usr/bin/ruby1.8 extconf.rb
extconf.rb:36:in `require': no such file to load -- mkmf (LoadError)
from extconf.rb:36

• The system I was running was Debian 7, and after searching around on the internet I found that I just needed to install the ruby development package:
  

  apt-get install ruby1.9.1-dev
  

Resources¶

• https://stackoverflow.com/questions/7645918/require-no-such-file-to-load-mkmf-loaderror