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run the command bundle install in your shell, once you have your Gemfile created. This command will look your Gemfile and install the relevant Gems on the indicated versions. The Gemfiles are installed because in your Gemfile you are pointing out the source where the gems can be downloaded from.
What does gem install do? gem install , in its simplest form, does something kind of like this. It grabs the gem and puts its files into a special directory on your system. You can see where gem install will install your gems if you run gem environment (look for the INSTALLATION DIRECTORY: line):
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
Just finished a 2 hour wild goose chase trying to solve this. None of the posted answers worked for me. Im on a Mac (Mojave Version 10.14.6, Xcode Version 11.3).
It turns out the ruby file headers were missing so i had to run open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
That didnt work for me at first because the version of CommandLineTools i had installed did not have the "Packages" folder. So i uninstalled and reinstalled like this:
rm -rf /Library/Developer/CommandLineTools
xcode-select --install
Then i ran the previous command again:
open /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg
After install the error was fixed!
I had the same issue trying to install jquery-rails. The fix was
sudo apt-get install zlibc zlib1g zlib1g-dev
In case anyone in the future had this problem, I'm using a Mac and just had to install the Command Line Tools using 'xcode-select --install'
I found that I needed to install another version of ruby. So running the command
$ sudo apt-get install ruby1.9.1-dev
and then attempt to install the extension
If you run into issues where it is telling you that you don't have g++ you can run the following command to install it
$ sudo apt-get install g++
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