Unable to install gem - Failed to build gem native extension - cannot load such file -- mkmf (LoadError)

There are similar questions:

Usually, the solution is:

sudo apt-get install ruby-dev

Or, if that doesn't work, depending on your ruby version, run something like:

sudo apt-get install ruby1.9.1-dev

Should fix your problem.

Still not working? Try the following after installing ruby-dev:

sudo apt-get install make

For WSL (Windows Subsystem for Linux) you need install build-essential package:

sudo apt install build-essential

I had the same issue trying to install jquery-rails. The fix was

sudo apt-get install zlibc zlib1g zlib1g-dev

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