Installing gems results in error
It looks like you're using Ruby 1.9.1 installed via the system. In order to fix that error, you should install the ruby-dev package.
In Debian/Ubuntu,
sudo apt-get install ruby1.9.1-dev.
Since the gem uses native extensions, you should also do a
sudo apt-get install build-essentials
before that.
However, I would strongly recommend using RVM and using the RVM ruby, since it pulls all most of the dev dependencies for your system and you don't have native extension problems so often.
SSL Error When installing rubygems, unable to install rails gem in windows 10
now I got solution for this issue, using this link http://guides.rubygems.org/ssl-certificate-update/#manual-solution-to-ssl-issue
we need to add GlobalSignRootCA.pem this certificate in ssl_certs folder insted of AddTrustExternalCARoot-2048.pem
go through that above link.
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